> On Feb 13, 2025, at 6:27 PM, Matt Selsky via Postfix-users > <[email protected]> wrote: > > Hi, > > Microsoft Exchange Online rejects messages with multiple From addresses if > there's no Sender address specified per > https://learn.microsoft.com/en-us/exchange/troubleshoot/email-delivery/ndr/fix-error-code-550-5-1-20-multiple-from-addresses > This is in relation to https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2
Sorry, I don't have an answer, but I'm curious what type of email you're seeing that triggers this. Is it spam or just cluelessness from sites doing this? If spam, any specific flavor? Charles > > Thanks, > -Matt > _______________________________________________ > Postfix-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] _______________________________________________ Postfix-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
