- Plesk Onyx
Trying to configure mailbox in mail client results in the following error:
CONFIG_TEXT: Authentication methods aren't supported by server.
CONFIG_TEXT: Couldn't establish the connection to the server due to untrusted or invalid certificate.
587 port is filtered by firewall and/or disabled in Tools & Settings > Mail Server Settings > Enable SMTP service on port 587 on all IP addresses;
AUTH option is absent in response to EHLO of telnet command:
# telnet mail.example.com 25
Connected to 203.0.113.2
Escape character is '^]'.
220 mail.example.com ESMTP Postfix
250-AUTH *** <-------------- is absent
First of all, check if the client has been configured correctly according to the articles below:
If Account is configured correctly try the steps below:
- Log into Plesk;
- Check that SMTP authorization is enabled under Tools & Settings > Mail Server Settings > Relay options:
- Check Tools & Settings > Mail Server Settings > Enable SMTP service on port 587 on all IP addresses:
- Go to Extensions > find Repair Kit extension and install, if it is not.
Then open it after the install or go to Extension > My Exteions > Repair Kit > Open.
Press Repair opposite to the Mail Server:
If that will not help, check the resolution from the article below:
Sending messages from webmail fails: SMTP Error (250): Authentication failed