problems sending mail

[catchyoverhang]

Hello, i have been ising ossec 3.7 for about a year now on a debian bookworm machine. I used to get alerts via email but now i dont. My ossec lpgs show the following:

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2025/01/29 11:55:43 rootcheck: INFO: Ending rootcheck scan.
2025/01/29 13:14:00 getaddrinfo: System error
2025/01/29 13:14:00 ossec-maild(1223): ERROR: Error Sending email to mta5.am0.yahoodns.net (smtp server)
2025/01/29 15:14:43 getaddrinfo: System error
2025/01/29 15:14:43 ossec-maild(1223): ERROR: Error Sending email to mta5.am0.yahoodns.net (smtp server)

My ossec.conf contains:

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<global>
   <email_notification>yes</email_notification>
    <email_to>user@yahoo.com</email_to>
    <smtp_server>mta5.am0.yahoodns.net</smtp_server>
    <email_from>ossec@mydomain.com</email_from>       
</global>

I am able to use:

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swaks --to user@yahoo.com --from ossec@mydomain.com
swaks --to user@yahoo.com --from ossec@mydomain.com --server 127.0.0.1 # I have a locally running exim server
swaks --to user@yahoo.com --from ossec@mydomain.com --server mta5.am0.yahoodns.net

All the swaks commands successfully send an email. Anybody have any ideas why this stopped working?

Thanks