FastVPS / Practical services
Email not working?
Identify whether the issue is with the account, app or DNS.
Try webmail
Open webmail from the email service in the panel. If it fails there too, check the account and mailbox password. If webmail works, inspect the app settings.
Separate sending from receiving
For sending, check SMTP, secure port and authentication. For receiving, check IMAP, quota and MX. Look in the Junk folder too.
Read the error
Keep the exact time, sender, recipient and error code or bounce message. Do not enter passwords or message contents into the public tool.
Check DNS and open a ticket
Run the domain checker for MX, SPF, DKIM and DMARC. Published records do not prove successful delivery. Send the details above in a private support ticket if needed.
Reference: SMTP · RFC 5321