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Old 25 May 2022, 12:40 AM   #2
The "e" in e-mail
Join Date: May 2003
Location: mostly in Thailand
Posts: 3,038
I am not completely certain that I understand your current setup. Assuming
  1. you have a Fastmail account associated with each email address; and
  2. is a domain administered by a Fastmail account.
You just define domain aliases for each address, directing the messages to be delivered to the appropriate account. Although the messages are delivered from, you simply do not define a sending identity for name@xxx, and messages will automatically be sent out from the default email address. Note, however, that the fact that your correspondents have sent to you as will still be visible in your reply. Only the address you use to send the reply is (along with any further replies by the original sender).

If is not administered by a Fastmail account, it will be necessary to use forwarding in a way that will differ from one mail service to another, and you might also need to be careful about possible message delivery issues that can these days arise when using email forwarding.

If you describe your current setup more clearly, we can probably give you better advice.
BritTim is offline   Reply With Quote