Since my setup was not included in the previous answers, here is my email setup:

- I have a domain: mydomain.com
- In: catch-all
- Out: wildcard out
- Server: DomainFactory - old mailboxes (not migrated to Exchange)

Setup in MailMate:
- Set up an IMAP email account
- [x] Checked under Address Pattern: `.*@mydomain\.com` (do not forget the backslashes, etc., because it is a regex)

References:


- Blog Post: https://blog.freron.com/2013/handling-multiple-identities/


- Section Adress Pattern: https://manual.mailmate-app.com/account_setup

MailMate Help" Address Pattern

This is an advanced feature for users with many email aliases. It allows you to tell MailMate the format of email addresses used for the account without listing them explicitly. Using this information MailMate can analyze the headers of an incoming message and automatically derive an appropriate address to be used for the default “From” address in a reply. This is combined with the “Full Name” specified above. The value used for this option must be a so-called regular expression. Example values are:


| Regular expression | Description |
| :--- | :--- |
| `address1@example\.com\|address2@example\.com` | An explicit list of alternative addresses | | `address[0-9]*@example\.com` | Any address with an arbitrary suffixed number such as `[email protected]` | | `username\+.*@example\.org` | Any address with an arbitrary plus-suffixed string such as `[email protected]` | | `mm-.*@freron\.com` | Any address with mm- prefixed such as `[email protected]` |




On 14 Feb 2026, at 2:14, [email protected] wrote:

As I manage my own domain name I'm able to make-up mail addresses to match the group or organisation I'm dealing with whenever I'm asked to provide one.

Rather than creating a corresponding email account on my server (too much effort) I simply create a Smart Mailbox in Mailmate which filters on the TO address.

Mail to these addresses all ends up in the postmaster account unless I generate a forwarding rule. I usually reserve that action for forwarding them to /dev/null when the organisation becomes annoying.

That works perfectly for receiving mail. However, when I reply to mail the FROM field is postmaster@ rather than my whatever_lol@ not-an-email address.

I'd really like to have some way of auto populating the From or the Reply-to field without having to remember to use the Customise option.

Are there any hidden tricks in Mailmate that I can leverage to achieve this?

thanks,
Malcolm
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