Again about reputation, or how not to become an intermediary in sending spam
Configure or help clients configure DKIM signing and DMARC policy (see ). Try to reduce the indicators as much as possible, and not just bring them closer to the existing limits. This will allow you to have a margin for various experiments and innovations without risking email deliverability.
2. Completion of work with the client
Many clients tend to move from one ESP to another (or go on their own). Return to clients who leave you an already segmented base, in which the main lists / segments will either be absent or clearly separated: users unsubscribed from mailing lists; users who have not confirmed the subscription using the double opt-in mechanism, etc. At email marketing conferences, ESPs (as well as their clients) often talk about their desire to establish long-term relationships with users and unambiguously choose “white hat” methods of work. But at the same time, the number of ESPs that return to their customers, in the event of the departure of the latter, a well-developed, good base, is rather small. Let's follow the strategy of long-term relationships not only during presentations, but also in the process of real work with clients!