The comprehensive Arduino Email Client Library to send and read Email for Arduino devices. The library also supports other network shields or modules e.g., Wi-Fi, Ethernet, and GSM/4G modules.

SMTP client with sendmail compatible interface

A minimalist client for sending mail direct to recipient's MX

Extracts URLs from a mail message and checks it against one or more URI blacklists.

An interface to the popular open source SpamAssasssin mail analysis tool, which returns a score based on a comprehensive set of patterns and Bayesian checks.

Limit the number of messages by connecting client IP, sender, or recipient.

SMTP / LMTP client command-line compatible with sendmail(1) utility

Block connections from remote sites that are sending spam, thus reducing load on your mail server.

smtp_wrapper is a SMTP filtering support daemon

Grey listing is an anti-spam technique that keeps track of tuples consisting of the connecting IP, sender's envelope, and recipient's envelope. If a tuple, does not exist in the cache, then a new entry is added and kept until it expires and the message is temporarily rejected.

Provides a means by which client connection and envelope details and/or message headers and content can be filtered using shell commands or scripts. Intended as a way to implement quick & dirty content filtering solutions when there is no other suitable milter available.

Provide an interface to the popular open source Clam Anti-Virus scanner.

An independent implementation of the RFC 4408 Sender Policy Framework (SPF-Classic).

A “call-forward” milter for mail gateways to verify that mail recipients exist on an authoritative mail store before the gateway accepts the message.

An independent implementation of the RFC 4408 Sender Policy Framework (SPF-Classic).

Provides a means by which client connection and envelope details and/or message headers and content can be filtered using shell commands or scripts. Intended as a way to implement quick & dirty content filtering solutions when there is no other suitable milter available.

smf-spamd: Smart Sendmail Filters

Extracts URLs from a mail message and checks it against one or more URI blacklists. Can also verify if any link is bad or broken.

Limit the number of messages by connecting client IP, sender, or recipient.

A simple SMTP Client library for C/C++