Symptoms
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Unable to log in to webmail (Horde, Roundcube, MailEnable, etc.) after migration
Login Failed
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A DNS propagation tool shows that the webmail URL (e.g
webmail.example.com) still resolves to the previous server's IP address
Cause
The webmail's DNS record isn't fully propagated yet and still points to the old server in some locations.
Resolution
Wait until the new record is available on all global DNS servers. This process can take up to 48 hours.