Implementing POP3 and IMAP4 Using Dovecot

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Implementing POP3 and IMAP4 Using Dovecot AfNOG 2017 Scalable Internet Services (SS-E) Nairobi, Kenya Presented by Kevin Chege (Built on materials developed by Joel Jaeggli)‏

What is POP3 POP3 stands for Post Office Protocol ver 3 Described in RFC1913 Runs on TCP Port 110 as a client server function Allows for a maildrop service (similar to the post box mail service ) hence the name By design its limited in features to download and delete email from server Security was also limited to using APOP (md5 hash for authentication RFC 2449 proposed POP3 extensions which included SASL Mechanism, Expiry, Pipelining, etc. RFC 2595 describes using TLS with POP3 also known as POP3s and runs on port 995

What is IMAP4? Internet Message Access Protocol version 4 Described in RFC 1730 Runs on TCP Port 143 as client-server function More advanced in features compared to POP3 IMAP4 stores mail on server and copies can be transferred to the client on request. By default only the message headers are sent to the client, the rest of the message is accessed on opening the email. Allows client to access and manipulate email residing on a server, creation of folders, filters, etc. RFC 1731 describes the IMAP Authentication Mechanisms RFC 2595 describes using TLS with IMAP4 running on TCP port 993

Mail Storage Formats Mailbox Format (Mbox) Defined in RFC 4155 All messages in an Mbox mailbox are concatenated and stored as a plain text in a single file Mails are stored in RFC822 format with a blank space separating each message (2 spaces as each message has one space) and “From” determining start of next message. Mbox has a distinct disadvantage in cases of large mailbox (a single large file) requires more resources to read/open and can be slow depending on the servers load.

Maildir Storage Format Mail Directory Format (Maildir) Each message is stored in a separate file with a unique name and each folder in a directory Maildir++ provides extension to the Maildir specification providing support for subfolders and quotas. Maildir directory has 3 folders temp, new and current

How Maildir Works The mail delivery agent stores all new emails to the mailbox in the tmp directory with a unique filename. (unique = time + hostname+ random generated number) The MDA creates a hard link to the file in tmp/unique to new/unique The Mail User Agent will check for new emails in new folder and move them to current folder The MUA modifies the filename to add a colon (:), a ‘2’ and various flags to represent message status i.e read, replied, forwarded, deleted, etc

Why Dovecot? High-performance POP and IMAP server Developed byTimo Sirainen Unlike say UW IMAP it wasn't written in the 80s Supports both mbox and maildir formats Graceful around failures (index repair for example) Designed with Security in mind – support for Authentication Mechanism and SSL/TLS