Incoming email APIs

All the following services deliver incoming email to your app via an HTTP POST web hook.

Documentation	Cloudmailin	Mailgun	Mandrill	Postmark	Sendgrid
POST data	Sample	Sample	Sample	Sample	Sample
Cost per incoming email	free (200/mo) ¢0.30 ($9/mo) ¢0.57 ($17/mo) † ¢0.25 ($25/mo) ¢0.225 ($45/mo) ¢0.2125 ($85/mo) ¢0.20 ($200/mo)	free (200/day) ¢0.10 ($19/mo) ¢0.05 ($59/mo) ¢0.04 ($199/mo)	free (12k/mo) ¢0.025 ($9.95/mo) ¢0.090 (>40k) ¢0.065 (>140k) ¢0.045 (>340k) ¢0.040 (>1.34M)	¢0.15 ¢0.05 (>500k)	free (200/day) ¢0.085 ($79.95/mo) ¢0.050 ($199.95/mo) ¢0.045 ($399.95/mo)
Pricing summary	Most expensive per email		Most free emails	No monthly minimum	Most expensive starting plan
Inbox	Many addresses	Any address @example.com	Any address @example.com	One address	Any address @example.com
Forwarding	MX record, email	MX record	MX record	MX record, email	MX record
Message size limit	100KB 500KB 500KB 2MB 10MB 50MB 50MB	25MB	10MB	10MB	20MB
Retry if	5XX HTTP code or unreachable	non-200 HTTP code	non-200 HTTP code	non-200 HTTP code	non-200 HTTP code
# retries		8 hours		10	3 days
Retry interval		5 min. to 4 hours		1 min. to 6 hours
Fail if	4XX HTTP code	404 or 406 code
Dedicated IP		$59/mo plan	$29.95/mo	N	$79.95/mo plan
Strip quoted	Y	Y	N	N	N
Parse attachments	Y	Y	Y	Y	Y
SPF	Y	Y	N	Y	Y
DKIM	N	Y	N	Y	Y
SpamAssassin	N	Y	N	Y	Y
Mailbox	N	Y	N	N	N
Heroku add-on	Y	Y	Y	N	Y
Attachment whitelist	N	N	Y	Y	N
Other features	Transfer attachments directly to Amazon S3
Ruby libraries			mandrill-api	postmark-mitt, postmark-gem	sendgrid-parse
Additional documentation		Manual, FAQ		FAQ

† The $17/mo "Micro Plus" Cloudmailin plan is the same as the $9/mo "Micro" plan, plus custom domains and S3 attachments.

Notes:

Mailgun has the best features.
You must send over 12,000 per month for Postmark to be more expensive than the cheapest Mailgun plan.
Google Apps will perform spam filtering before forwarding.

The following services do not offer an incoming mail webhook:

DIY:

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