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Old 22 Mar 2019, 02:36 AM   #2
FredOnline
The "e" in e-mail
 
Join Date: Apr 2011
Location: Manchester UK
Posts: 2,616
Does this help, from the FastMail aspect, in the web interface:

Settings
Identities & Fetch

Scroll down to:

Compose new messages from XXXX by default.

Check/Tick box: Force all emails I send through 3rd party email clients to come from this address.
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