AutoMailSenderBest SMTP apps for Mac
If you want a full email client that speaks SMTP — inbox, folders, replies — Apple Mail or Thunderbird are the picks. If you just want to send files over SMTP/TLS to a fixed set of people with a drag, AutoMailSender is the focused option: free for your first 25 emails, then a one-time €9.99, credentials stored in the macOS Keychain.
Try AutoMailSender — free for 25 emailsFull client vs focused sender
Everything here sends over SMTP, but they aim at different things. A client manages your whole mailbox: receiving, reading, organising, replying. A focused sender skips all of that and does the outbound "send this file to these people" step as fast as possible. Decide which you actually need.
| App | Full client vs sender | Drag-to-send | Folder routing | Price |
|---|---|---|---|---|
| AutoMailSender | Focused file sender | Yes — one drag | Yes — watched folder → email | Free for 25, then one-time €9.99 |
| Apple Mail | Full client | Opens a compose window | No | Free (built in) |
| Thunderbird | Full client | Opens a compose window | No auto-email routing | Free, open-source |
| Generic SMTP client | Varies — often send-only | Usually form-based | Rarely | Varies |
How each one stacks up
AutoMailSender — Not an inbox. It's a focused sender that pushes files straight over SMTP/TLS to people you email repeatedly. Set the recipients once, then a drag-and-drop sends with no compose window, and watched folders can auto-send. Works with Gmail, Outlook / Office 365, iCloud, Yahoo or any custom SMTP host; credentials live in the macOS Keychain, nothing routes through a third-party server. Native macOS (macOS 14+, ~1.7 MB). Choose it when the job is sending, not reading.
Apple Mail — The full, native client. It manages your accounts over IMAP/SMTP, handles the inbox, threads, rules and search. For being your everyday email home it's excellent and free. For repeatedly sending the same file it's slower, because every send opens a compose window you have to address.
Thunderbird — A free, open-source, full-featured desktop client that speaks SMTP and manages multiple accounts, folders and extensions. A strong choice if you want a cross-platform mailbox you fully control. Like any client, it's built around composing and organising mail, not around one-drag file sending.
Generic SMTP client — There are lightweight, send-only SMTP tools that just relay a message to a server. They're handy for scripts, testing or notifications, but they tend to be form- or command-driven and rarely have preset-recipient or watched-folder convenience. Good for developers; less so for a daily file-sending habit.
Which should you pick?
Pick Apple Mail or Thunderbird if you need a real client — an inbox, replies, organising. Pick a generic SMTP client if you're relaying mail from scripts or testing servers. Pick AutoMailSender if you already have an email account and just want the outbound "send this file to these people" task to take one drag instead of a whole compose window.
Download on the Mac App StoreFAQ
Is AutoMailSender an email client?
No. It's a focused file sender, not an inbox. It uses your existing account over SMTP/TLS to send files to preset people. For reading and replying you'd still use Apple Mail or Thunderbird.
Which SMTP servers does AutoMailSender work with?
Gmail, Outlook / Office 365, iCloud, Yahoo, or any custom SMTP host. It connects directly over TLS/SSL and stores credentials in the macOS Keychain.
Do I need a full client if I only send files?
Not necessarily. If sending files to fixed people is the whole job, a focused sender like AutoMailSender is faster. If you also read and organise mail, keep a full client like Apple Mail or Thunderbird.
How much does AutoMailSender cost?
Free for your first 25 emails, then a one-time €9.99 for unlimited sending. A one-time €49.99 Enterprise tier adds scheduled & recurring sends and more than two sender accounts. No subscription.