openssl_verify_mode=>"peer" can cause OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed · Issue #1076 · mikel/mail · GitHub
![SMTP TLS fails to verify certificates with default setting of ' openssl_verify_mode: peer' (#790) · Issues · GitLab.org / charts / GitLab Chart · GitLab SMTP TLS fails to verify certificates with default setting of ' openssl_verify_mode: peer' (#790) · Issues · GitLab.org / charts / GitLab Chart · GitLab](https://gitlab.com/uploads/-/system/user/avatar/923527/avatar.png)
SMTP TLS fails to verify certificates with default setting of ' openssl_verify_mode: peer' (#790) · Issues · GitLab.org / charts / GitLab Chart · GitLab
actionmailer 3.2.13 requires "mail ~> 2.5.3" breaking compatibility · Issue #9780 · rails/rails · GitHub
![How to verify that SSL for IMAP/POP3/SMTP works and a proper SSL certificate is in use – Plesk Help Center How to verify that SSL for IMAP/POP3/SMTP works and a proper SSL certificate is in use – Plesk Help Center](https://support.plesk.com/hc/user_images/vjwyZ1jR0MBJyseMoE3RiA.png)