Question 1

Postal or clojure.java.mail for sending emails in Clojure?

Accepted Answer

Postal provides a higher-level, idiomatic Clojure API that wraps Jakarta Mail for simplicity, while clojure.java.mail offers more direct, low-level control. Choose Postal for standard email sending with a cleaner interface.

Question 2

How to send an email with attachments using Postal?

Accepted Answer

Use the body parameter as a sequence of maps with type and content keys, as shown in the examples. For attachments, specify :type as :attachment or :inline with a Java File object, and set content-type if needed.

Question 3

How to configure Postal for Gmail with TLS encryption?

Accepted Answer

Set the host to smtp.gmail.com, port to 587, and :tls to true, along with :user and :pass for authentication, as detailed in the Gmail example. Note that Google may require 'allow less secure apps' setting.

Question 4

What are the dependencies for Postal?

Accepted Answer

Postal requires Jakarta Mail and Java 8+, with dependencies managed through Leiningen or similar tools. The README specifies Jakarta Mail is included in lib/ after build.

Question 5

Can Postal be used with Amazon SES?

Accepted Answer

Yes, by using SMTP credentials from the AWS Console and configuring :host, :port, :user, and :pass, as demonstrated in the Amazon SES example. Ensure addresses are verified for sandbox testing.

Question 6

Does Postal support UTF-8 encoding for international characters?

Accepted Answer

Yes, but you must set the charset explicitly in the :type field, like "text/html; charset=utf-8", because Jakarta Mail defaults to us-ascii, as explained in the UTF-8 section.

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