by EverPress 5 (1 reviews)

Mailster SendGrid Integration

Name: Mailster SendGrid Integration
Rating: 5.0 (1 reviews)
Author: EverPress

Deliver Mailster newsletters with SendGrid via the Web API or SMTP, with API key checks, categories, and bounce syncing.

Mailster SendGrid Integration ranks #7,193 among WordPress.org plugins with 900+ active installations, is #361 of 2,802 in the Contact Forms category, a 5/5 rating from 1 reviews, and was last updated Oct 15, 2026. Data from WordPress.org, refreshed twice daily — see methodology.

Compatible with WP 7.1.4

v2.1.1 Current Version v2.1.1

Updated 3 weeks ago Last Update on 15 Oct, 2026

Refreshed 6 days ago Last Refreshed on

#361 of 2,802 in Contact Forms Top 10% by installs Downloads -9.3% this week Actively maintained

View on WordPress.org

Rank

#7,193

— No change

Active Installs

900+

-7.5%

KW Avg Position

26.5

0.5 worse

Downloads

27.7K

+6 today

Support Resolved

— No change

Rating

100%

Review 5 out of 5

5 (1 reviews)

Next Milestone 1K

Total Progress 58%

900+ 1K+

282

Ranks to Climb

Growth Needed

8,000,000

Active Installs

Pro

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Rank Changes

Current #7,193

Change

Best #

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Active Installs Growth

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Active Installs 0,000,000+

Growth +0.0%

Peak 0,000,000

Downloads Growth

Downloads

Growth

Peak

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Reviews & Ratings

5.0

1 reviews

Overall 100%

1 (100%)

0 (0%)

Security History

Source: WPVulnerability

No known vulnerabilities on record for Mailster SendGrid Integration. Checked 3 months ago.

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Plugin Details

Version: 2.1.1
Last Updated: Oct 15, 2026
Requires WP: 6.0+
Tested Up To: 7.1.4
PHP Version: N/A
Author: EverPress

Support & Rating

Rating: ★ ★ ★ ★ ★ 5
Reviews: 1
Support Threads: 0
Resolved: 0%

Keywords

email mailster mailsteresp newsletter sendgrid

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TL;DR

AI summary of the plugin's readme

This plugin is for WordPress site owners who use the Mailster Newsletter Plugin to send email campaigns. It solves email delivery by routing Mailster's outgoing emails through SendGrid.

SendGrid email delivery
Integrates with Mailster Newsletter Plugin

Frequently Asked Questions

Common questions about Mailster SendGrid Integration

No. This is a delivery addon for the Mailster Newsletter Plugin and requires Mailster 4.0 or newer.

Yes. You need a SendGrid account, an API key, and a verified sender or authenticated domain. SendGrid is a separate email delivery service; see SendGrid for current plans. This plugin is not a SendGrid product.

WEB API (recommended) sends with POST https://api.sendgrid.com/v3/mail/send and supports categories, reply-to, attachments, and inline images. SMTP API relays through smtp.sendgrid.net with username apikey and your API key as the password. Use port 465 when “secure connection” is enabled, or port 587 when it is not.

Mailster’s setup guide asks for Mail Send access so messages can be sent, and Suppressions read access so bounces, blocks, spam reports, and unsubscribes can be imported. The plugin checks the key with SendGrid’s scopes endpoint.

Choose SendGrid (recommended) to import suppressions into Mailster. With the Web API, Mailster cannot process bounces itself, so bounce handling is set to SendGrid. With SMTP you can choose Mailster’s bounce mailbox instead, but SendGrid must have preserve headers enabled or the return path is overwritten. When SendGrid handles bounces, the settings on Mailster’s bounce tab are ignored. Details: How to handle bounces with SendGrid.

On the Web API you can enter up to 10 comma-separated SendGrid categories. SendGrid uses categories to group messages. They are not a substitute for Mailster lists.

Yes. When this delivery method is active, Mailster sends email content and related delivery metadata to SendGrid so messages can be delivered. Suppression data is read back from SendGrid’s API.

For Mailster and this addon, see mailster.co and the SendGrid setup guide. For SendGrid account, billing, and API questions, use SendGrid’s Mail Send documentation.