Many recipients of my mails to various *[email protected] addesses are rejecting the messages due to SPF failures. Is there anything that can be done about this in general?

e.g.:
<[email protected]> (expanded from <[email protected]>): host mx05.up.pt[193.137.55.46] said: 550 5.7.23 <[email protected]>: Recipient address rejected: Message rejected due to: SPF fail - not authorized. (in
    reply to RCPT TO command)

Reporting-MTA: dns; bastion01.rdu3.fedoraproject.org
X-Postfix-Queue-ID: 2EBCC79395
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Sat,  9 Aug 2025 22:41:03 +0000 (UTC)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.23
Remote-MTA: dns; mx05.up.pt
Diagnostic-Code: smtp; 550 5.7.23 <[email protected]>: Recipient address
    rejected: Message rejected due to: SPF fail - not authorized.

--
Orion Poplawski
he/him/his  - surely the least important thing about me
IT Systems Manager                         720-772-5637
NWRA, Boulder/CoRA Office             FAX: 303-415-9702
3380 Mitchell Lane                       [email protected]
Boulder, CO 80301                 https://www.nwra.com/

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