Do forwarding rules have SRS turned on?

[randian]

Originally Posted by WormholeLawyer

But... can you even use an alias to send mail via a third-party client like Apple Mail or Thunderbird? Wouldn't the SMTP send it as your account login, since that is the user/pass you use with Fastmail's IMAP server?

Yes, you can use aliases with SMTP clients. You don't use the alias as the IMAP/SMTP login, you use your regular account address. That authentication step is separate from the SMTP transaction itself, which will use your alias.

[WormholeLawyer]

Originally Posted by randian

Yes, you can use aliases with SMTP clients. You don't use the alias as the IMAP/SMTP login, you use your regular account address. That authentication step is separate from the SMTP transaction itself, which will use your alias.

If you are sending/receiving from more than one alias, how does SMTP know? It seems like the big issue would be your mail program would be confused. If I get an email to myalias@mydomain.com but login with myname@mydomain.com and then I reply to all on an email to myalias, it would probably copy my alias into the reply all list because the IMAP program doesn't know that is really my email address.

[CyberDyne]

The login email account (username in server settings) and the sending email account (identity email address / reply address) on your third party client are separate and can different.

Your client 'logs into' your account with one and sends your email with the other - which has been authorised to do so by the successful login.

If you want to set up more than one alis to use, you simply create more accounts on your client.

[BritTim]

Originally Posted by WormholeLawyer

If you are sending/receiving from more than one alias, how does SMTP know? It seems like the big issue would be your mail program would be confused. If I get an email to myalias@mydomain.com but login with myname@mydomain.com and then I reply to all on an email to myalias, it would probably copy my alias into the reply all list because the IMAP program doesn't know that is really my email address.

The username and password you use when accessing an SMTP server is purely intended to authenticate your right to use the server. (Indeed, at one time, it was common to access SMTP servers without even specifying a username and password). The From address, To address(es) and (if used) Reply To address of your message(s), in principle, have absolutely no relationship to this username and password. The message is created by your mail client and the SMTP server does not change it (apart from adding some headers that indicate the SMTP server used and the date/time).

The From address (or Reply To address) must be a known email address. If this is a Fastmail alias, Fastmail takes care of this and knows which account should receive the email. If using a virtual alias (for your own domain) then it is your responsibility to identify the account (Fastmail or external) that should receive emails to that address.

[MikeMcr]

Getting back on topic, did anyone discover a way to enable SRS for a forward rule? I know there is no SRS checkbox on the forward rules page but I was hoping there was a special sieve command to do this?

[n5bb]

Originally Posted by MikeMcr

Getting back on topic, did anyone discover a way to enable SRS for a forward rule? I know there is no SRS checkbox on the forward rules page but I was hoping there was a special sieve command to do this?

No, there is currently no Sieve command or setup to do this directly. But here is a work-around which I have verified works to get SPF passing with both Outlook.com and Gmail using SRS rewriting at Fastmail:

• Set up an alias (normal or virtual) which targets the external account (or accounts) which need to receive the forwarded messages. Activate SRS on this alias.
• Set up a normal rule which forwards certain messages (redirect) to the SRS alias described above.
• Now incoming messages sent to any address (including your main account login address) which satisfy certain rules can be forwarding using rules to the special alias, which then applies SRS and sends to an external account. If you need to control this individually for several external target address, you will need to devote one alias (or virtual alias if you have your own domain) per external forwarding address.

Bill

[MikeMcr]

Originally Posted by n5bb

No, there is currently no Sieve command or setup to do this directly. But here is a work-around which I have verified works to get SPF passing with both Outlook.com and Gmail using SRS rewriting at Fastmail:

Thanks for this, I was worried the extra processing may break DKIM checks but a test with GMail seems to look OK for both SPF and DKIM.

[jdmc]

Prior to encountering this thread, I was unfamiliar with the terms "SRS", "SPF", and "DKIM" in the context of email. For the benefit of others new to these concepts who may come across this thread in the future, Wikipedia offers articles explaining Sender Rewriting Scheme (SRS), Sender Policy Framework (SPF), and DomainKeys Identified Mail (DKIM).