> On Feb 13, 2025, at 6:27 PM, Matt Selsky via Postfix-users > <postfix-users@postfix.org> 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 -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
