is anyone else seeing weird email deliverability issues?

so, my email platform's been acting like it had too much coffee lately.

i'm seeing some really strange deliverability issues, especially with gmail, where bounce rates are suddenly through the roof for no obvious reason. it's like the emails are just disappearing into the void after sending.

here's a snippet from the campaign report:

[2023-10-26 14:35:01] INFO: Campaign 'October Newsletter' initiated.
[2023-10-26 14:35:05] WARN: SMTP connection timed out for [email protected].
[2023-10-26 14:35:06] ERROR: Recipient [email protected]: 550 5.7.1 Unauthenticated email from example.com is not accepted due to domain's DMARC policy. Please contact the administrator of example.com.
[2023-10-26 14:35:07] WARN: Potential soft bounce for [email protected].

anyone faced this before?