fetchmail/fetchmail
TLS-enabled mail retrieval (POP3/IMAP/ETRN/ODMR) and forwarding (SMTP/LMTP/MDA) agent. Note the Git branches: legacy_6x (6.5.x release maintenance) and next (mid-term future 7.x.x development)
GitLab repository with 34 stars and 36 forks.
Language: C
Topics: POP3, client, e-mail, email, imap, ssl, tls