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Opt-In Mail

Opt-In Mail is a small application to send e-mail. You don't need to use your provider's SMTP server because Opt-In Mail sends e-mail directly.

The key feature of the program is an ability to sign your message using Yahoo! DomainKeys technology. Opt-In Mail adds a header named "DomainKey-Signature" that contains a digital signature of the contents of the e-mail. The DomainKeys-enabled receiving email system extract this signature and claimed From: domain from the email headers, fetches the public key from DNS for this domain and verifies that the signature was generated by the matching private key.

First of all you need a public/private key pair to use for signing e-mail.
You can use this openssl command to generate a 512 bit private key:

$ openssl genrsa -out rsa.private 512

To extract the public key component from private key, use openssl like this:

$ openssl rsa -in rsa.private -out rsa.public -pubout -outform PEM

Read more details how to generate a DomainKey public/private key-pair here.
Save the private key to the file on your disk and enter the path to it in "Private Key File" field in Opt-In Mail.
Pick a selector name (e.g. "s1"). Enter it in "Selector" field in Opt-In Mail.
Put the public key data in DNS, in your domain, using the selector name you picked. Your public key file should contain lines like this:

-----BEGIN PUBLIC KEY-----
MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhALHOmM8.....4AA
/vQrcgpbdhCPLlT/AVDedXH/dBU1CDiVVt+3XnY65TAIEFI...wq0/
L7c2UfU+jZ3FaXKKWYdztHWF...QAB
-----END PUBLIC KEY-----

Take the contents of the public key without PEM header and footer, concatenate the lines together and create a TXT entry like this:

s1._domainkey IN TXT "k=rsa; t=y; p=MHwwDQJKo...QAB"
Choose Canonicalization algorithm - the method by which the headers and contents are prepared for presentation to the signing algorithm.
Opt-In Mail supports "simple" and "nofws" values.

Download Opt-In Mail now

See also

Opt-In List Manager

Email list management program. It is specially designed to provide an efficient way of processing huge email lists.

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Web Searcher

Web scraping tool. Allows to search in Google and Bing for keywords and extract various data from web pages and sites.

Web Image Uploader

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Web URL Shortener

Web URL Shortener is a tool that allows to create short URLs that can be easily shared, tweeted, or emailed to friends.

RegExp Extractor

RegExp Extractor is an utility designed to extract various data from text files and logs using conditions and rules written using regular expressions.