One to one communication procedures

Before you even start with your one-to-one communication…
be aware of the main procedures and terms

Every type of one-to-one communication should be governed by established rules. If you respect them, your chances for success dramatically increase. Therefore, it is not hard to see why it is worth to use ready solutions, which have already been proven and improved upon, in order to prevent making mistakes that could be easily avoided. The more precise the communication is and the more carefully it is selected to match the needs of the subscribers, the greater the chance it has of being noticed, and will therefore positively affect their willingness to visit the store or the website.

In this article, you can find some procedures that may look like material for nerds. But you can use it as a good guide to verify how your team is working with one-to-one communication. Below you will find some procedures around:

  • Database synchronisation
  • Email Sender Reputation
  • Bounces
  • The control group
  • Campaign frequency
  • Communication prioritisation
  • Opt-out
  • Autoresponder

So let’s begin!

Database synchronisation

You collect your customer email addresses, phone numbers and communication consent throughout different, scattered entry points: your website, mobile app, sometimes in-store kiosks or even still, by paper application. Probably, you store it in many different databases, sometimes serviced by different partners. As your one-to-one communication results depend on the quality of the data flow, you should pay special attention to the process pertaining to the synchronisation of the database with the recipient list. Before you hit the “send” button, your recipient list has to be up-to-date. The most desirable solution is an ongoing, real-time synchronisation for someone who has just signed up for a newsletter or service, his/her email address is immediately included in the defined mailing list.

If this is not possible in your company, you should ensure that the synchronisation is performed at least several times a week. Synchronisation before every mailing campaign is an absolute minimum, as customers withdraw their consent to receive communications from your brand and you must take this into account before beginning the next campaign.

Real-time synchronisation will secure that, you do not send the email to someone who doesn’t want it anymore, which will help you to secure a high level of your email reputation

Email Sender Reputation

Your reputation is a general belief or opinion that other people have about you. If you are considered trustworthy and kind, you have a good reputation. That’s how people consider, or label, you good or bad. It also applies to you as a marketer, who seeks contact with its subscribers via email. Are you considered a spammer or a reliable sender? 

So, caring for your email sender reputation is an ongoing process, and you can’t compromise being too greedy, dispatching the emails for any price. Your reputation will be determined by technology, so it’s good to understand the principles. The starting point is to secure a dedicated IP address assigned to the email server. This dedicated IP address gives you more control and influence over your reputation. It means that you are the only one responsible for the reputation of the server which translates into greater effectiveness of message delivery. When you share it with others, you can become the victim of somebody else’s mistakes. 

Once you sorted a dedicated IP address, it usually takes some time to build your reputation, so If you are only at the beginning of your one-to-one communication journey, I recommend you to start with the email account warm-up process. Just like before running or gym workouts your body requires proper exercises to prepare your heart, joints and muscles for bigger stress, similarly, your email account needs a warm-up. The warm-up process includes sending emails from a new email account, starting with a smaller number, and gradually increasing the number of emails each day.

And, finally, to optimise your reputation, make sure that each email is tested with specialised anti-spam tools and filters before sending it. It is an investment that pays off with the higher Delivery Rate. Such tools verify a number of communication parameters during tests, including the proper configuration of the sender’s mailbox, domain reputation, correct HTML in the message, availability of websites linked in emails, etc. All, to secure that you are not sending rubbish of any kind. 


Despite good email sender reputation, real-time contact synchronisation and good overall data quality in your systems, it still may happen that your message will not be delivered. Especially when you invested in your system, you should pay extra attention to every undelivered email, as it may mean holes in your procedures. In general, you can find two major cases in your Bounce Report:

  • Soft Bounce: that originated on the recipient side, e.g., the recipient mailbox is full or there was a temporary server failure;
  • Hard Bounce: that originated on your side, mostly due to data quality/synchronisation or reputation issue, e.g. if the recipient adds our email address to the spam list or the email address is incorrect. 

The number of bounces will impact your email sender reputation, so each case should be marked, including the reason for non-delivery in the database individually for each subscriber to avoid sending messages again to the hard bounces email. You might also want to consider verifying the email address, using other available channels of communication with the subscribers, like their mobile phone number. 

The control group

The paramount advantage of one-to-one communication, which your CFO would love above all other marketing communications is its countability. You can always show the ROI and incremental sales uplift, no strings attached. 

The basis enabler is setting the control groups, which are the key to measuring the effectiveness of one-to-one communication. Out of your total target audience, you exclude a randomly small, yet statistically significant group of subscribers, since the control group should be a representative selection of your target audience and thus accurately reflect how members behave without communication. By comparing the behaviour between the two groups, we can identify the effect of your communication.

And it’s great not only to prove the commercial performance of your action. It allows you to treat every single broadcast as an experiment in which the effect is unknown and comparisons between the control group and the treatment group behaviour are used to measure the effect of the treatment. By applying the rules, you can verify all your hypotheses and constantly improve both your financial results and customer engagement. 

The downside of setting aside the control group is that you voluntarily reduce your target audience. It is often questioned by sales managers, who would prefer carpet-bombing ways of communication. But at some point, you simply can’t switch off subscribers from all types of communication (e.g. post-purchase reward, which is a part of Terms & Condition). Nevertheless, it is good to set up some basic rules, that will help you to navigate. 

  • Quantity: the minimum value for the control group should be statistically significant and there is no need to boost it any higher. A good practice is to be consistent, putting aside always the same proportion between 1-3% of the entire database to which we plan to send the communication. 
  • Random selection: control group is always selected randomly based on the same criteria, which will allow you to compare the results between campaigns.

Control groups are a very powerful tool as they provide scientific proof of your communication performance. There are some limitations to them that I cover in this blog (link here), but in general, it is hard to find anyone in the organisation who will be questioning the results calculated based on them. 

This is why is I recommend working with control groups in two separate streams:

  • General control group: one general control group which will allow you to measure the global impact of one-to-one communication on business. Put aside 1-3% of your all communicable (valid address/phone number and consent), i.e. people who meet all criteria and normally would be communicated and excluded from all shipments for a period of time (e.g. one quarter). After this time, select randomly a new 1-3% group to put aside, restoring the old one to regular flow.
  • Dynamic control group: create separate control groups for every specific type of communication, triggered or of newsletter-type (with some exception as mentioned above reward example, or welcome email that should be sent to every subscriber). Regardless of the general control group, set aside a statistically significant portion of subscribers to measure the impact of this specific broadcast. 

Campaign frequency

The paradox of the emails is that we’re all tired of them. Our work sometimes reminds outlook management, cleaning the mailbox (and spamming our colleagues) nine-to-five. And yet, it is still one of the most effective communication channels. But every affection has its limit and even heavy users should get some slack.

For this reason, you should specify the frequency with which you will contact the subscribers and the maximum number of messages allowed to be sent within the defined time period. When you start and have no historical data, what are your customers’ preferences, you may set these principles at the beginning of the quarter, in consultation with the sales and marketing teams, ensuring that you do not overuse subscribers patience. 

In the beginning, this limit may be the same for all subscribers (e.g. 3 campaigns per week as a fixed value). With time, as you observe the subscribers responsiveness (Open Rate, Response Rate) you will be able to set the frequency on every single subscriber level (one per month for some, couple per week for brand lovers). Acceptable frequency most of all depends on the content and customer activity. Therefore people, in general, accept more triggers (based on their actions) than newsletters (based on what you want to say). People’s openness and responsiveness in your one-to-one communication depend on the context. It usually is correlated with two factors: brand affinity (the closer the emotional bond, the higher it becomes) and stage in the purchase process (the further in the funnel, the higher it is). 

Communication prioritisation

You always will have more to say than people will be interested to hear. We choose to work in our brands, mostly because we love (or at least like them). We love what we do, the content we prepare, and it is our job to share it with everyone. But our customers have many other problems, too. And every message, that is irrelevant for recipients will reduce their interest in the future. How many chances do you think you get? It is why the communication prioritisation process will help you to decide, what message is worth sending and what is better to keep for a better moment. 

Setting the communication frequency business rules and communication priorities business rules reminds the chicken and egg dilemma. It doesn’t matter where you start as long these two processes go together. 

It may happen that subscribers meet the criteria for receiving more messages, but this number exceeds the limit set by you. Therefore, you need to determine which campaigns and dispatch have the higher priority above the others. In the simple example, your subscriber meets the criteria to be communicated with, all at once: newsletter campaign about the new product, abandon browse and invitation to an event organised by your brand. If you send all of them, you will create your own clutter, and limit the overall engagement result. Sometimes less is more so please consider prioritisation. You can do it based on:

  • the communication itself, for example, giving priority to triggered communication over the newsletters;
  • behaviour or attributes of the segments (open rate/response level) 
  • or even individual customers level, which in practice means that for one subscriber the newsletter will have a higher priority and for another one – triggered communication will go first;

You can build your own criteria. The most important thing is to set them up on the real objectives, i.e.  what do you want to achieve in the long run? So it should be a mix of the expected revenue uplift (short term goals) and engagement objectives (long term goals). Higher sales will follow the engagement, so you should know, when you build the relationship and when you try to cash it. 


Your business rules regarding communication frequency and priorities give you a sense of control. But the truth is that the customers are in control here. By clicking or not, they decide how good work you have done. So, naturally, it may happen that some subscribers no longer want to receive communications from you and therefore, in accordance with legal requirements, they should be able to opt-out from the list of subscribers. 

Nobody likes when people use it, but the opt-out button should be included in every email you send. My recommendation is a discreet place in the footer, yet still visible to the receiver. If someone presses this button, you still have a chance to influence the final decision. With this process, you can only win or learn (as youtube coaches say).

On the curated landing page, you can prepare your elevator pitch, why it’s worth staying (to win), and ask them about the reasons behind decisions to leave you (to learn). Analysing this data will help you to improve and will be the foundation for further optimisations.  It is a good practice to include a mini-survey with a list of reasons for which the Customer decides to opt-out from communication; the examples like:

  • The content of the message is not interesting to me
  • I have received too many messages from you
  • I receive too many messages to my mailbox
  • I’m not the addressee of this email
  • Or others (you know what you did wrong

When you developed a wide range of communication scenarios (push, pull) with different channels (email, sms, pushes, etc.) remember also to offer the subscribers various ways to opt-out from communication. The decision about opting-out is usually spontaneous, triggered by a specific message (here and now). One button followed by one yes/no question (do you want to unsubscribe) maybe not be the most elegant strategy. Maybe they don’t want to receive your long newsletters, but they are still happy to get vouchers or information about discounts? Or maybe they don’t want to receive emails, but they are still fine with text messages on their phone?

I recommend you to secure the opt-in structure by asking:

  • Do they want to opt-out only from this type of communication (the one, that they’ve just opened)?
  • Do they want to opt-out from the specific channel (and name it)?
  • Do they want to opt-out of the specific communication program (and name it)?
  • Do they want to opt-out completely and (or) be removed from the subscribers’ list? 

Building this logic and presenting it to customers is quite a challenging UX work, but it pays off, as thanks to that your communication becomes more and more personalised, based on real customers’ wants. Remember to reflect similar logic in your database, because no matter what the customer decides, you have to respect it and don’t ship any more unwanted messages. 


When a customer receives the message from your brand, it sometimes reminds them about some unsolved issues (like ongoing claims). Or it simply raises some questions. It is why is worth assigning an autoresponder to each mailing. If someone uses the “reply” function in the message received, this email should be directed to your Customer Support Centre and the customer should get confirmation, that this case was registered. It may sound like another complex process for you, but imagine, that it can reduce the number of complaints and customer questions on your social media keep the “tough” discussion out of other people’s sight. A good practice is to answer such queries within 24 hours, to keep customers positively engaged.

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