Symptoms
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Unable to open the Webmail going to Domains > example.com > Email Addresses > Webmail, it might show one of the following error messages:
Not Found
The requested URL /roundcube/index.php was not found on this server.
Apache Server at webmail.example.com Port 80404 - File or directory not found.
The resource you are looking for might have been removed, had its name changed, or is temporarily unavailable.HTTP 404. The resource you are looking for (or one of its
dependencies) could have been removed, had its name changed, or is
temporarily unavailable. Please review the following URL and make sure
that it is spelled correctly.
Requested URL: /default.aspxPlesk default page
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Going to Domains > example.com > Web Hosting Access > The IP address assigned to the domain example.com in Plesk is 203.0.113.3
Cause
The DNS record for the webmail DNS record webmail.example.com resolves to a different IP address.
# dig +short webmail.example.com
203.0.113.2
Resolution
Note: After applying the changes in a DNS zone, it might take up to 48 hours to propagate the changes on global DNS servers
In case DNS settings are managed in Plesk
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Open Domains > example.com > DNS Settings > webmail.example.com
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Change the IP address to the same IP address assigned in Plesk. In this example: 203.0.113.3
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Click OK
In case DNS settings are managed externally
Access registrar's DNS Settings and change the IP address of the DNS record webmail.example.com to the same IP address assigned in Plesk. In this example: 203.0.113.3