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4

In order for mail to be delivered, postfix must be able to enter the user's home directory, and that directory must contain a complete Maildir tree containing the subfolders tmp, cur and new, all with the correct permissions. Since you've already checked that the Maildir exists, has the correct folders, and has the right permissions, what remains is ...


2

1) Conceivably, from a purely technical angle: yes 2) No. The world operates with mx records and there is no incentive to change from a working solution to a different-but-functionally-identical solution. 3) The ability to direct mail for a given domain a non-standard port


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On a purely theoretical functional/technical level: Yes. In reality: No way. You would have to change an extreme amount of software and every MX related DNS entry. Potential gain: Effectively zero. No, not that I am aware of. It's useless, so why should there be one? SRV allows to specify ports. That could be a minor advantage, but since everyone has ...


2

Apparently I've been hoist by my own methodology's petard. It now looks like the reason that the date header caused the message to be accepted by the smart host without being delivered is that I didn't change the timestamp in the header with each test. So the smart host saw multiple message with identical message IDs and timestamps coming in, and just ...


1

with the wizard in MS Outlook creating rules is trivial. One rule for all messages with an attachment: A second rule for all messages, except those with attachments:


1

Don't mix forwarding and relaying. Forward occurs when received and delivered message is sended by MUA to another address. Relaying occurs when MTA direct the undelivered message to another MTA for further processing.


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Note: smtp != smtpd smtp act as smtp client used to sending email smtpd act as smtp server used to receiving email Parameter smtp_sasl_type with dovecot was unsupported. Maybe you mean smtpd_sasl_type = dovecot instead.



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