config: add option to hide timezone in sent emails

Some people are worried that they might leak their timezone and wish to
send their mails with the Date header in UTC. For this a new key is
added to the account sections to enforce sending in UTC instead of the
system's timezone.

Suggested-by: "Ricardo Correia" <aerc-lists.sr.ht@wizy.org>
Thanks: to Ricardo for checking and correcting my incorrect assertions
Signed-off-by: Moritz Poldrack <git@moritz.sh>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Support for bindings with the Alt modifier.
 - Zoxide support with `:z`.
+- Hide local timezone with `send-as-utc = true` in `accounts.conf`.
 
 ### Changed
 

config/config.go

@@ -163,6 +163,7 @@ type AccountConfig struct {
 	EnableFoldersSort bool     `ini:"enable-folders-sort"`
 	FoldersSort       []string `ini:"folders-sort" delim:","`
 	AddressBookCmd    string   `ini:"address-book-cmd"`
+	SendAsUTC         bool     `ini:"send-as-utc"`
 
 	// CheckMail
 	CheckMail        time.Duration `ini:"check-mail"`

doc/aerc-config.5.scd

@@ -686,6 +686,11 @@ Note that many of these configuration options are written for you, such as
 
 	Default: Drafts
 
+*send-as-utc*
+	Converts the timestamp of the Date header to UTC.
+
+	Default: false
+
 *source*
 	Specifies the source for reading incoming emails on this account. This key
 	is required for all accounts. It should be a connection string, and the

widgets/compose.go

@@ -584,8 +584,12 @@ func (c *Composer) PrepareHeader() (*mail.Header, error) {
 		}
 	}
 	if !c.header.Has("Date") {
+		if c.acctConfig.SendAsUTC {
+			c.header.SetDate(time.Now().UTC())
+		} else {
 			c.header.SetDate(time.Now())
 		}
+	}
 	return c.header, nil
 }