swaks
Swiss Army Knife SMTP, the all-purpose SMTP transaction tester. tldr-pages
On Linux
Linux
Deliver a standard test email to user@example.com on port 25 of test-server.example.net
swaks --to user@example.com --server test-server.example.netIdentifyDeliver a standard test email, requiring CRAM-MD5 authentication as user me@example.com. An "X-Test" header will be added to the email body
swaks --to user@example.com --from me@example.com --auth CRAM-MD5 --auth-user me@example.com --header-X-Test "test_email"IdentifyTest a virus scanner using EICAR in an attachment. Don't show the message DATA part
swaks --to user@example.com --attach - --server test-server.example.com --suppress-data path/to/eicar.txtIdentifyTest a spam scanner using GTUBE in the body of an email, routed via the MX records for example.com
swaks --to user@example.com --body path/to/gtube_fileIdentifyDeliver a standard test email to user@example.com using the LMTP protocol via a UNIX domain socket file
swaks --to user@example.com --socket /var/lda.sock --protocol LMTPIdentify