I assume @Raiden is referring to gray email avatars but I let him elaborate further.
Anyway when considering the problems described by Raiden above, it’s not clear why dropping email support is the best way to address those problems. In Raiden’s thread about gray email avatars, he proposed several solutions which do not involve dropping email support.
Even if it’s true that only few people use paid accounts or their own email server, abandoning these users in order to force everyone onto chatmail doesn’t seem justifiable. However, it’s not quite true that you need to use a paid account or your own server to avoid sending limits, as some people have had success explaining their situation with Delta Chat to their email provider and they raised the sending limit for them.
Saved bandwidth and storage space on relays could be a real advantage, but the experience of relay operators so far suggests that at least storage space is not yet even close to a problem.
Delta Chat has already shown us that innovations are possible, for example we now have message editing and deletion all done through email, and I would encourage the exploration of further innovations with Delta Chat and Chatmail.
For example there have been several requests for scheduled messages here, here, and here, and now that chatmail is the default/recommended type of server for the app, I think it is worth revisiting this idea, but notably features like this could be achieved without dropping email support,