Some emails are not being delivered

Some emails are not being delivered

I have this problem where some of my mail just seems to disappear.

When I send it, it appears as sent with no mention of any problem, but my recipient never gets it, not even in the Spam folder.

Same for receiving, I have a secondary e-mail address, and my main e-mail address is listed in the recipients list, but I never get it on my main e-mail address.

This problem seems to occur more frequently with one particular domain (transperfect.com).

Thanks in advance for any help.
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