421 too many commands

Question

We mostly use our workmail for standard company mail but we do run a few tasks that send automated emails and we have started seeing "421 too many commands". Is this is because of a rate limit? If so, what is the send rate limit for sending with workmail via smtp?

Answer

Yes, this is because of a rate limit. The SMTP protocol is complementing the IMAP procotol because it's the only protocol that does not send email. We allow low rates of sending for normal email clients and automated systems will probably hit out rate limiting. Depending on your usecase you might be better off looking into using SES to send large amounts of email.

421 too many commands

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