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It would be great if you can not only receive but also send from a catchall alias. Imagine the following setup:

  1. You have a regular mailbox user@domain.com
  2. You have a catchall alias for @aliasdomain.com to hide your actual email that forwards to user@domain.com - that covers the incoming mail and is already possible.
  3. Any mail sent from [anything]@aliasdomain.com is processed and put into user@domain.com SENT folder. This covers your outgoing mail. That way if you need to sent mail from one of your aliases you don’t have to actually create a mailbox for it. That way we could have similar functionality to the commercial mail alias services.

If this or similar setup is already possible please comment. What do you think?

For the user@domain.com Mailbox set “Allow to send as” to “Disable sender check for domain domain.com (+ alias domains)” if aliasdomain.com is set up as alias domain for domain.com. This will allow to chose [anything]@ as sender address in your mail clients.

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    That sounds exactly as what I was looking for. I’ll look in to it.
    Thanks

    a month later

    I tried this, but the alias does not show as selectable ‘sender’.

    N,v,m. found it, it now is in ‘identities’ , Not as convenient as the automatic aliases, but it works…

      4 months later

      MrH Hey, I just set up mail server for testing specifically for this reason. I am not getting any luck. I tried what heavygale responded, but I get RED text and send button get grayed out. Any suggestion.

          NVM, I figured it out to after keep changing settings.

          • MrH replied to this.

            dididoit Do you mean you can type “a random emailaddress”@domain.tld to sent from? (where domain.tld is ofcourse yours)? ’Cause I cannot get that to work…

                8 days later

                MrH no, it isn’t as easy as you and I want. I hope they implement something like fastmail had done where you can reply from whatever email you want

                  MrH Do you mean you can type “a random emailaddress”@domain.tld to sent from?

                  That’s how it works if you set “Allow to send as” to “Disable sender check for domain example.com (+ alias domains)” for the mailbox you want to be able to send mails vom anything@example.com
                  Everything else depends on your mail client:

                  If you are using SOGo, you’ll need to add the additional sender addresses identities in the Mail settings (Preferences -> Mail -> IMAP Accounts -> Edit -> New Identity)

                  You’ll then be able to select the new sender when cmposing an email:

                  In oher mail clients like Thunderbird it’s easier, as you simply can modify the sender address in the from field.

                      I had the same solution, but hoped you stumbled upon a workaround in sogo as fastmail (apparently) provides…

                      2 months later

                      heavygale I will check out as I finally decided to have my own mail server. I was testing at that time.

                        7 months later

                        heavygale

                        I tried to do exactly the same as thread starter:
                        1) Added a regular domain ‘maindomain.com’ with a regular mailbox ‘info@maindomain.com’
                        2) Added a Domain Alias ‘alias.com’ with ‘maindomain.com’ as target domain.
                        3) Added a catch-all alias ‘@alias.com’ with GoTo address ‘info@maindomain.com’. (Is this step really needed? I did this because otherwise random emails to @alias.com were bounced back)
                        4) For mailbox ‘info@maindomain.com’ I enabled ‘Disable sender check for domain maindomain.com (+ alias domains)’

                        So far so good. I receive every random e-mail address to random@alias.com in my info@maindomain.com mailbox.
                        But I have some difficulties with the SOGo identities part. When I add a new identity to info@maindomain.com mailbox, I only see ‘info@alias.com’ in my dropdown list. No ‘some-random-sender’ like in your screenshot. And I think mailcow decided to name the catch-all alias ‘info’, because I never entered that name.

                        What am I doing wrong? Did I miss something?

                            DYD 3) Added a catch-all alias ‘@alias.com’ with GoTo address ‘[info@maindomain.com](mailto:info@maindomain.com)’. (Is this step really needed? I did this because otherwise random emails to @alias.com were bounced back)

                            Yes, as stated in the UI: "Aliases are not applied on domain aliases automatically. An alias address my-alias@domain does not cover the address my-alias@alias-domain (where “alias-domain” is an imaginary alias domain for “domain”).
                            Please use a sieve filter to redirect mail to an external mailbox (see tab “Filters” or use SOGo -> Forwarder). Use “Expand alias over alias domains” to automatically add missing aliases. "

                            DYD But I have some difficulties with the SOGo identities part. When I add a new identity to [info@maindomain.com](mailto:info@maindomain.com) mailbox, I only see ‘[info@alias.com](mailto:info@alias.com)’ in my dropdown list. No ‘some-random-sender’ like in your screenshot.

                            Ignore the dropdown list, simply enter your desired address.
                            The example wit “some-random-sender” was a alias addes in the mailcow ui (not a catchall alis), wich will automatically be added as sender address in SOGo (no identity needs to be added in SOGo for those).

                            • DYD replied to this.

                                  heavygale
                                  Thank you for taking the time to answer my question.
                                  So in SOGo I have to create a new identity every time I want to use an unused alias? I just tested it and it works.
                                  And indeed in Thunderbird I can just enter any alias email address.
                                  So I now have my ‘low-end’ Simplelogin.io service.😄

                                    6 months later

                                    Hi, I also like the idea of having a catchall subdomain for arbitrary individual mail addresses.
                                    However, since many MUAs do not support hassle-free changing of the sender address, I came up with the following solution:
                                    GitHub Icon GitHub - xofolowski/RSFA

                                    GitHub Icon GitHub
                                    GitHub - xofolowski/RSFA
                                    Contribute to xofolowski/RSFA development by creating an account on GitHub.
                                    Contribute to xofolowski/RSFA development by creating an account on GitHub.

                                    This will automatically set the correct sender address when replying to a mail previously received on a catchall subdomain address.

                                    HTH

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