K-9 Mail waa codsi iimaylo madax banaan oo loogu talagalay nidaamka hawlgalka Android. Waxaa loo heli karaa sida Free/Isha Furan ee Software Android ee hoos timaada shatiga Apache-2.0. Barnaamijka waxa loo suuq geeyaa beddelka shaqayn kara ee codsiga boostada caadiga ah ee ku jira telefoonada intooda badan. Waxay taageertaa sanduuqyada boostada POP3 iyo IMAP labadaba waxayna taageertaa IMAP IDLE ogeysiisyada-waqtiga dhabta ah.