postal is a library for constructing and sending RFC822-compliant Internet email messages. It wraps the JavaMail package for message and SMTP support. It supports sendmail natively. Supports STARTTLS & SSL.
- Anything that can run Java should work
- sendmail support likely requires *nix, but
msmtp, et al., are worthy substitutes - Untested on Windows
- JavaMail 1.4.2 (in
lib/after build)
Served by Clojars. In your Leiningen project.clj:
[com.draines/postal "1.10.3"]
Likewise substitute any tag name from git.
At a bare minimum, provide a map with :from and :to (and you'll
probably also be wanting :subject and :body, though they're
technically optional). Any other keys you supply will show up as
ancillary headers. This example will locally inject the message into
sendmail.
user> (in-ns 'postal.core)
#<Namespace postal.core>
postal.core> (send-message {:from "me@draines.com"
:to ["mom@example.com" "dad@example.com"]
:cc "bob@example.com"
:subject "Hi!"
:body "Test."
:X-Tra "Something else"})
{:code 0, :error :SUCCESS, :message "message sent"}
postal.core>
To use SMTP, add metadata with a :host key.
postal.core> (send-message ^{:host "mail.isp.net"}
{:from "me@draines.com"
:to "foo@example.com"
:subject "Hi!"
:body "Test."})
{:code 0, :error :SUCCESS, :message "message sent"}
postal.core>
Authenticate to SMTP server with :user and :pass.
postal.core> (send-message ^{:host "mail.isp.net"
:user "jsmith"
:pass "sekrat!!1"}
{:from "me@draines.com"
:to "foo@example.com"
:subject "Hi!"
:body "Test."})
{:code 0, :error :SUCCESS, :message "message sent"}
postal.core>
You probably do not want to do this in the clear, so add :ssl to get
an encrypted connection. This will default to port 465 if you don't
specify one.
If your destination supports TLS instead, you can use :tls. This
will default to port 25, however, so if you need a different one
make sure you supply :port. (It's common for ISPs to block outgoing
port 25 to relays that aren't theirs. Gmail supports SSL & TLS but
it's easiest to just use SSL since you'll likely need port 465
anyway.)
postal.core> (send-message ^{:host "smtp.gmail.com"
:user "jsmith"
:pass "sekrat!!1"
:ssl :yes!!!11}
{:from "me@draines.com"
:to "foo@example.com"
:subject "Hi!"
:body "Test."})
{:code 0, :error :SUCCESS, :message "message sent"}
postal.core>
Since Amazon SES uses authenticated SMTP, postal can use it. Just make sure you use a verified address and your SMTP credentials (visit the AWS Console to set those up). Also, if you're just sandboxing, you can only send to a verified address as well. Example:
postal.core> (send-message ^{:user "AKIAIDTP........" :pass "AikCFhx1P......."
:host "email-smtp.us-east-1.amazonaws.com"
:port 587}
{:from "me@draines.com" :to "me@draines.com"
:subject "Test from Amazon SES" :body "Test!!!11"})
{:error :SUCCESS, :code 0, :message "messages sent"}
postal.core>
Attachments and multipart messages can be added as sequences of maps:
postal.core> (send-message ^{:host "mail.isp.net"}
{:from "me@draines.com"
:to "foo@example.com"
:subject "Hi!"
:body [{:type "text/html"
:content "<b>Test!</b>"}
;;;; supports both dispositions:
{:type :attachment
:content (java.io.File. "/tmp/foo.txt")}
{:type :inline
:content (java.io.File. "/tmp/a.pdf")
:content-type "application/pdf"}]})
{:code 0, :error :SUCCESS, :message "message sent"}
postal.core>
If your attachment has a content-type that is not recognized by
JavaMail, e.g., .pdf or .doc, you can set :content-type. You
can also set :file-name and :description if you don't like the
filename that :content uses.
If you want another multipart type than "mixed", you can specify it as a keyword as the first value in the map sequence. That way you can for example create an HTML-Email that displays a text message as fallback in email clients that do not support (or suppress) HTML-mails:
postal.core> (send-message ^{:host "localhost"
:port 2500
:user "user@localhost"
:pass "somePassword"}
{:from "jon-doe@example.com"
:to "jane-doe@example.com"
:subject "multipart/alternative test"
:body [:alternative
{:type "text/plain"
:content "This is a test."}
{:type "text/html"
:content "<html><head> </head><body>
<h1>Heading 1</h1><p>This is a test.</p>
</body></html>"}
]}))
Postal uses JavaMail under the covers, which defaults to charset
us-ascii. To set the charset, set the :type, like "text/html; charset=utf-8".
Postal will supply a message ID by default that looks like
[random]@postal.[host]. You can customize this by supplying a
:message-id header with a function that takes no args. The included
postal.support/message-id can be used if you'd like to make use of
its randomness and only customize the hostname.
{:from "foo@bar.dom"
:to "baz@bar.dom"
:subject "Message IDs!"
:body "Regards."
:message-id #(postal.support/message-id "foo.bar.dom")}
You can customize the default User-Agent header (by default
postal/VERSION).
{:from "foo@bar.dom"
:to "baz@bar.dom"
:subject "Message IDs!"
:body "Regards."
:user-agent "MyMailer 1.0"}
You can stress-test a server by:
postal.core> (stress ^{:host "localhost"
:num 1000
:delay 250 ;; msecs
:threads 5 ;; concurrent connections}
{:from "foo@lolz.dom"
:to "bar@lolz.dom"})
sent 1000 msgs to localhost:25
nil
postal.core>
% lein deps && lein jar
André Branco
Joe Gallo
Christoph Henkelmann
Gerrit Hentschel
Jeff Palmucci
Allen Rohner
Paul Stadig
Sam Ritchie
J. David Lowe
Kevin Dejong
Colin Jones
Andy Fingerhut
Postal is (c) 2009-2013 Andrew A. Raines and released under the MIT license.