Commas in the Name Field - Broken Sends
Came across an issue that would be worth looking into. It looks like if a user has a comma in their name. FluentCRM campaign mailer does not properly escape that. So when it gets sent into the SMTP sender with that comma, it causes a syntax issue and therefore causes delivery failure.
The issue actually could be with FluentSMTP, specifically with the Postmark handler in this particular case, not actually accommodating for that.
Just had this happen with my own site, but I've actually had it come up on a couple of my clients as well. Most of my clients are using Postmark, so this might explain it.
We fix in both FluentCRM and FluentSMTP