And here in the SMTP archives you'll find everything we've written on the GMass blog about SMTP, including:
- How to use a third-party SMTP with GMass to break Gmail's limits and send virtually unlimited emails
- GMass's own SMTP service for transactional emails
- Reviews of SMTP services
- Our tools to analyze your SMTP settings to flag any potential issue
- And all other SMTP-related tips and findings

September 6, 2023
How to Get Around Mimecast Blocks
Is Mimecast blocking the emails you're sending? Here are steps you can take to get around Mimecast blocks so your emails make it to the inbox properly.
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August 22, 2023
How to Choose the Right SMTP Service for GMass
If you're going to use a third-party SMTP service to send high-volume email campaigns in GMass, here's what you want in the service you choose.
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August 19, 2023
Confused About SMTP Options in GMass?
GMass offers a few different SMTP options: Using our accounts on other servers, our in-house server, transactional relay, and more. Here's how they differ.
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August 17, 2023
How to Use the DKIM Settings in GMass — And Why You Should
How to set DKIM in GMass when you're using an SMTP service to send through Gmail, either your own SMTP account or one of GMass's in-house options.
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September 15, 2022
Email Bounce Codes: The Complete Guide (Definitions, Solutions, and More)
A glossary of email bounce codes to help you understand why your emails weren't delivered. Plus steps and strategies to manage and to cut down on bounces.
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April 21, 2022
How to Use GMass’s SMTP Relay to Send WordPress Transactional Emails
How to use GMass's SMTP relay service to send WordPress transactional emails like confirmations and receipts through your Gmail account.
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April 11, 2022
Why GMass + SendGrid is Better for Campaigns Than SendGrid Alone
You can send email campaigns via SendGrid's Marketing Campaigns — but it lacks the features of GMass. Instead, use GMass for emails with SendGrid for SMTP.
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September 22, 2021
Introducing a new kind of SMTP Service
Instead of using SendGrid, Mailgun, or Amazon SES to send emails from your website, use the GMass SMTP service and have your emails sent by Google.
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October 5, 2020
Postmark Review 2023 (Features, Limitations, Pricing)
Looking for a comprehensive Postmark review? This article covers its key features, major limitations, and pricing details.
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September 24, 2020
SMTP.com Review 2023 (Features, Drawbacks, Pricing)
Looking for a thorough review of SMTP.com? This article highlights the key features, drawbacks and pricing details of SMTP.com
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September 23, 2020
Mandrill Review 2023 (Features, Pricing, Drawbacks)
Looking for a detailed Mandrill review? This article highlights its key features, drawbacks, and pricing details to help you out.
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September 18, 2020
Proof that Google allows sending from a gmail.com account through an external SMTP server
Ever since we launched the ability to hook your account up to an external SMTP provider and essentially “break” Gmail’s …
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