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Old 21 Jan 2022, 01:33 AM   #3
BritTim
The "e" in e-mail
 
Join Date: May 2003
Location: mostly in Thailand
Posts: 3,084
The first thing to understand is that Fastmail only supports sieve scripts to be applied at the time of email delivery. Sieve scripts on outgoing mail, for instance, is not supported.

As far as incoming mail is concerned, the sieve support is pretty comprehensive. However, it is recommended to minimise custom sieve using the Rules interface as far as possible. This insulates you against rearrangement of the overall script's structure by Fastmail over time.

Sometimes, if you really want to take some action at the same time as you send messages, you can arrange to trigger your sieve script by using a bcc. For example, you can include a bcc to Bank+JustSent@yourFastmailAlias.com, and generate appropriate actions accordingly.
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