PostageApp!

Scalable email delivery for transactional emailSendGrid transparently handles DKIM, SPF, ISP rate limits, content inspection, bounces, and spam reports to help users achieve higher deliverability. SendGrid integrates in minutes by just changing three SMTP settings.

Mailgun is email automation for developers. Use our REST APIs to effortlessly send, receive and track email from your website or application.

Elastic Email offers an SMTP Relay, HTTP API, and fully featured browser based UI for managing marketing and transaction email.

Cloud Emailing by Mailjet. Create, send and track your marketing and transactional emails. Easy SMTP integration & cheap rates: boost your deliverability now!

Postmark removes the headaches of delivering and parsing transactional email for webapps with minimal setup time and zero maintenance. Send API and SMTP interface.

Send emails and know when they were opened. Keep detaile email logs to who they were sent and when. A memo system to help organizations notify thier employees and keep everyone on the same page. Simple and easy to use email memo service.

SMTP2GO is an email service provider, performing the task of reliably delivering transactional and marketing emails, and providing reporting tools to track and visualize what is happening with outgoing emails.

Get 3 months free "Unlimited Transactional Emails" with Pepipost.

JangoSMTP lets you send transactional emails via SMTP or API. It's the first transactional email service to offer open and click tracking.

Aspose.Email for Android API enables developers to design Android applications for managing & manipulating Outlook email file formats without using MS Outlook. It provides tools to create, read & convert Outlook MSG, PST, EML, EMLX, OST & MHT file formats. It manages recipients, subject, message body, attachments in MSG documents. It creates & save appointments in draft format, extract & save calendar items from a PST, add Mapi Items such as Messages, Contacts, Notes, Journals & Tasks to a PST. »

A simple API and Dashboard to manage and optimize emails sent by your application to your customers.

SMTP Logic integrates with your current email system to automate all aspects of email processing, from analytics to security.

In the simplest terms AuthSMTP is an outgoing SMTP email server, it can be used to send email from any program, application or device that can connect to an SMTP server and authenticate with a username and password.

CritSend's full SMTP relay service and API ensures inbox delivery for your transactional mails. Never worry about email compliance, deliverability, IP reputation or blacklisting. Free email service from CritSend.