Errors hit "a significant subset" of Google Gmail users connecting with the IMAP protocol on Monday, the company said.
IMAP, or Internet Mail Access Protocol, is used to access Gmail on mobile devices and mail clients like Microsoft Outlook. Users affected by the problem can access Gmail but see error messages or other "unexpected behavior," Google said.
The tech giant first detailed the issues at about 10:30 a.m. ET and the problems were resolved by 1:15 p.m.