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Looks like the emails coming from stellar are delivered from an SMTP origin "mailgun.info" which uses an invalid client certificate; I'm getting errors:

SSL_accept error from mail-182-5.mailgun.info[23.253.182.5]: 0 warning: TLS library problem: XXX:error:XXX:SSL routines:SSL3_READ_BYTES:sslv3 alert bad certificate:s3_pkt.c:1258:SSL alert number 42:

At least they retry without SSL aftwards, and manage to deliver the emails.

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Hi 0x0, Russell from Mailgun here. Do you have a self signed certificate by any chance? We typically downgrade a connection if we are presented with a self signed certificate. That might be what you are seeing.

If you drop us an email at support [at] mailgun.com with your domain I can take a look at the specific issue we are having delivering over TLS to your domain.

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