The Mutt E-Mail Client : Reference : Configuration variables : imap_keepalive
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## 6.3.83. imap_keepalive

Type: number
Default: 900

This variable specifies the maximum amount of time in seconds that mutt will wait before polling open IMAP connections, to prevent the server from closing them before mutt has finished with them. The default is well within the RFC-specified minimum amount of time (30 minutes) before a server is allowed to do this, but in practice the RFC does get violated every now and then. Reduce this number if you find yourself getting disconnected from your IMAP server due to inactivity.

The Mutt E-Mail Client : Reference : Configuration variables : imap_keepalive
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