Generate RFC822 compliant e-mail messages for tests and send it over SMTP.
While it's easy to send test messages like echo asdf | mail you@gmail.com
or via telnet mx.example.com 25
I need a tool which:
- Generates valid messages
- Messages does not looks spammy or very suspicious
- Easy to use and repeat test
- Ability to customize messages
- Work well with msmtp or other full-featured SMTP client (e.g. which can send over secure SMTP connection with authentication)
- Support DKIM signatures
pip3 install testmsg
or
pipx install testmsg
$ testmsg --to you@gmail.com --lorem
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Subject: Sent with github.com/yaroslaff/testmsg
From: from@example.com
To: you@gmail.com
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempo=
r incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut al=
iquip ex ea commodo consequat.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore =
eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia des=
erunt mollit anim id est laborum.
To actually send message via SMTP server add --send localhost
or (if you need really powerful SMTP client features) pipe to msmtp:
testmsg --lorem --to you@gmail.com --from you@example.net | msmtp --host mail.example.net -v --tls=on --tls-starttls=on --auth=on --user=you@example.com --passwordeval "echo YourPass" -f you@example.net you@gmail.com
Use --from
, --to
and --subject
to override basic properties of message, use --add HEADER VALUE
to add custom header(s).
Default message text is empty, use --text "blah blah blah"
or --lorem
or --msg PATH
or --msg -
.(to read from stdin). Add --time
to add current time as an prefix to text.
Use --attachment
(or --att
) to add attachments: --att FILE1 FILE2 ...
Generate DKIM RSA keys:
# generate private RSA key for DKIM
openssl genrsa -out example.com.pem 1024
# generate public key for DKIM
openssl rsa -in example.com.pem -out example.com.pub -pubout
Make DKIM DNS record with as SELECTOR
._domainkey.example.com and verify it (here I decide to use selector mail
):
$ host -t txt mail._domainkey.example.com
mail._domainkey.example.com.net descriptive text "v=DKIM1; h=sha256; k=rsa; p=MII...."
send DKIM signed message to gmail or mail-tester.com! Use --selector
and --privkey
arguments.
testmsg -f test@example.com -t mailbox@gmail.com --lorem --selector mail --privkey example.com.pem -v --send localhost
Here we send with TLS and authentication (using msmtp). Username for authentication (--user
) is same as FROM address. Testmsg generates valid message and msmtp sends it.
FROM=sender@example.com
TO=recipient@gmail.com
testmsg -f $FROM -t $TO --lorem | msmtp -v --host smtp.office365.com --port 587 --user $FROM --passwordeval='echo MyTestPass' -f $FROM --tls=on --auth=on $TO