UPDATE 14:20 EST
The issue has been resolved. Services for PapaMail have been healthy for some time now and users are able to login to the webmail. Thanks for your patience and understanding.
We have identified an issue with the PapaMail servers. Some mailboxes are not being accessible from webmail. IMAP and POP services are not affected by the issue. Our engineering team is working on implementing a permanent fix.
We will continue to provide updates as we work through this issue.