How to Handle SMTP Authentication | Mailtrap Blog
https://mailtrap.io/blog/smtp-auth26.08.2019 · 25 – In some cases, SMTP AUTH can be used on this port as well. 25 is known as the message relay port. Code 535 – Authentication failed and other SMTP AUTH errors . The SMTP server can reply both positively and negatively to the AUTH command. Positive response codes are: 334 – the requested security mechanism is accepted
SMTP Error (535): Authentication failed - How we Fixed it
12.04.2019 · Finally, we ensured correct settings in Tools & Settings > Mail Server Settings > Enable SMTP service on port 587 on all IP addresses. Enable SMTP Authentication In cPanel. Let’s have look on the steps to enable SMTP auth in …