I am trying to find a solution/plugin to remind me about adding attachments to an email on MacMail (using OS X El Capitan). I tried the "just double check your email, you idiot" option to no avail.

There is a deprecated plugin and wanted to know if any alternatives have been developed, or if there's a new sneaky setting that might do this for me.

I also found this post but given that's 3+ years old I would like more up to date feedback, in the hope that Apple has opened a new door.

Anyone know of a simple solution to this?

2 Answers 2


It looks like there is a Mail plugin which does what you're looking for called Send Companion (free, with other paid features). As of the time I'm writing this, it purports to work with the latest versions of Mail.

  • From the Send Companion website: "Currently Send Companion is not under active development, we support our current users but don’t sell any new licenses."
    – bitFlipper
    Feb 2, 2018 at 15:33

MailButler does this and much more for the Mac mail app.

I tested the attachment reminder feature in MacOS Sierra (10.12.1) and it worked perfectly: Screenshot of working attachment reminder

They have a free version and two tiers of paid versions, though the free version has a lot of good features (including the attachment reminder):

  • Undo Send
  • Cloud Upload
  • Attachment Reminder
  • Avatar Images
  • Direct Inbox
  • Emojis
  • Unsubscribe
  • Inbox Pause
  • Quote
  • Giphy

Their website mailbutler.io has descriptions of all the features.

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