On 12/4/24 12:00 PM, Cyril Nicodeme via mailop wrote:
Technically, RFC speaking, there is no maximum number of recipients. However, many implementations will block over a certain amount. For example, Z/os can accept 2000 recipients, but Amazon AWS SES will limit to 50. Also, RFC5321 Sec. 4.5.3.1.8 requires that an MTA supports at least 100 recipients. But as you can see, Amazon doesn't respect that. To be on the safe side, you should consider to limit sending to 50 or 100 recipients at once. That said, if you send more than allowed, the MTA should give you a 421 response (still following RFC5321).Hi everyone,I was wondering if there was a standardized limit, or a "common sense" limit on how many (valid) RCPT command a client can send. If they want to send an email to a thousands recipients that are on the same MX server, would they be able to do that in one session or would they have to split the number of MAIL FROM/RCPT TO/DATA commands ?
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