Ограничения почтовых серверов

Доброго дня участникам!

Обнаружил ограничения, присущие почтовым серверам на количество сообщений, вернее на число получателей писем/сообщений.

Для Яндекса это 35 участников включая создателя группы. То есть невозможно отправить сообщение в группу с почты на Яндексе, если число участников в группе (получателей) 35 человек и более.

Очевидно, что и другие почтовые сервера имеют такие ограничения.

Это в свою очередь означает, что большие группы создавать нельзя и об этом нужно прямо сказать на сайте и в описаниях, что бы не вводить пользователей в заблуждение.

Hi. This forum is meant to be for english only so I took the liberty to translate it. Hope the translation is ok.

Good day to the participants!

I found the limitations inherent in mail servers on the number of messages, or rather on the number of recipients of letters / messages.

For Yandex it is 35 participants including the creator of the group. That is, it is impossible to send a message to a group from mail on Yandex, if the number of participants in a group (recipients) is 35 or more.

Obviously, other mail servers have such limitations.

This in turn means that it is impossible to create large groups and this should be directly stated on the website and in the descriptions, so as not to mislead users.

For Nauta(Cuba) I think the number is even smaller!!! Like only 10 recipients!! but I have to confirm this.

That is, the most restrictive mail server determines the possible number of group members…

Theoretically, you can open a mailbox in phplist or other mailing services, but in practice it is unrealistic.

I see one solution: it is necessary to set up a DeltaChat to send messages in batches, but here is the size and how often - it is necessary to investigate the limitations of mail servers. For example, 10 messages at a time, another 10 in X minutes, etc. And it would be good if the first recipient didn’t start answering until everyone got the message.

Or keep all the groups on one server (Delta Chat server), which carries out distribution to all recipients at once. And removes the letter immediately after the distribution, and there are a lot of servers in transit.

that would really mess up the things, the good point about Delta Chat is that “there are NOT a Delta Chat server”

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Groups rarely exceed a few dozen participants, to a maximum of hundred. But still it is possible and some solution is needed. Or to clean groups in General because already on two e - mail servers we have 10 and 35 participants-a difference in 3,5 times.

also I think that having a limited amount of recipient is a way for servers to limit spam, a big group in practice only means a big mess, and tons of messages

well, torchat and ricochet don’t have groups, only eye to eye; tox didn’t test

it turns out that if you do not make the delta chat server, there is only one way out-a portion of sending messages to the group

group limit is a server restriction not a Delta Chat restriction, in a real situation where a company or a self hosted email server needs a group to be bigger they can relax the restriction.
Anyway message size is also restricted by email servers in the case of Cuba (Nauta server) the maximum size is 2MB.
following your idea, what should happen if I send an image of 10MB to a group of 30 friends??? first the message is split in smaller pieces and then in smaller groups of recipients??? quite a mess :frowning:

For users with Internet access this only means choose a better server, for Cuba this means just keep smaller groups and send small messages, and that is OK since the cost of messages is proportional to the size for us.

Yes, and the size of the messages matters… and if the Internet is expensive and very bad? we also need to think of something… I think one solution is to be consistent sending messages to all group members: first one is gone - a received server response OK, then another and so on And the indicator would be good to have: 1 of the 10 left, 2 of 10, etc. So would I size of the messages received: we try to send to the first recipient - leaves - OK, next, go, stop, do not send attachments.

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Tox have groups, but like xmpp or irc without register a channel. All disconnect and the group dissapear