The Mutt E-Mail Client : Reference : Configuration variables : use_8bitmime
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## 6.3.255. use_8bitmime

Type: boolean
Default: no

Warning: do not set this variable unless you are using a version of sendmail which supports the -B8BITMIME flag (such as sendmail 8.8.x) or you may not be able to send mail.

When set, Mutt will invoke `` $sendmail'' with the -B8BITMIME flag when sending 8-bit messages to enable ESMTP negotiation.

The Mutt E-Mail Client : Reference : Configuration variables : use_8bitmime
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Next: use_domain