Mail Merge doesn't work

Hello community!

I hope I find a helpful solution here.

Namely, I have been having a problem with mail merge for some time now, and as I update sending mail with its help, it becomes more and more responsible.

When I did this before, there was no problem with sending 500 emails, but when it happened, it was about 100 or sometimes it was interrupted.

I have been using it for several years and have not encountered a problem before. Perhaps you have any suggestions as to what might be wrong?


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