alias f__1 Me <my.one@address.example.org>
alias f__2 Myself <another@address.example.com>
alias f__3 I <somewhere@else.local>
macro compose <esc>f "<edit-from><kill-line>f__<tab><search>another@address.example.com<enter>"

$ cat .msmtprc
defaults
tls on
tls_trust_file [redacted]
logfile [redacted]
domain serverdomainexample.tech

account example
host smtp.example.com
port 587
auth on
from user@example.com
user user@example.com
password correct-horse-battery-staple

account example2
host smtp.example2.net
port 587
auth on
from user2@example2.net
user user2@example2.net
password correct-horse-battery-staple-2

account default : example

$ cat .mutt/muttrc
...
set sendmail      = '/usr/bin/msmtp'
set realname      = 'User'
set use_from      = 'yes'
set envelope_from = 'yes'
set from          = 'user@example.com'
alternates          '(user@example.com)|(user2@example2.net)'
macro compose <esc>1 '<esc>f^UUser <user@example.com><enter>'
macro compose <esc>2 '<esc>f^UUser2 <user2@example2.net><enter>'
send2-hook '~e user2@example2.net' "set sendmail = '/usr/bin/msmtp -a example2'"
...