Email deliverability

What are MX Records?

A brief introduction to our favourite kind of DNS records: the MX record.

Written by Matt
Updated this week

Can I use ImprovMX SMTP to send Bulk Mail / create Mailing Lists?

Details about the possibilities when it comes to using ImprovMX for bulk mailing or mailing lists.

Written by Matt
Updated over a week ago

Can I Whitelist an Email Address?

Looking to whitelist an email address you frequently receive mail from?

Written by Matt
Updated over a week ago

How to view email headers

Email headers will tell the full transit story of a particular email. This can often help diagnose possible delivery or alignment issues.

Written by Nate
Updated over a week ago

Regex Email Forwarding

Using Regex (Regular Expressions) to Supercharge your Email Forwarding

Written by Matt
Updated over a week ago

About ImprovMX Spam Filtering

Written by Matt
Updated over a week ago

Using MX Records of Multiple Services

Details of why having MX records for multiple mail providers is not a supported configuration.

Written by Matt
Updated over a week ago

What are the sending/receiving limits?

How many emails can you receive, forward or send using ImprovMX forwarding and SMTP capabilities.

Written by Antoine Minoux
Updated over a week ago

Redirecting an alias to multiple email addresses

It is possible to redirect a forwarding alias to more than one email address. Just separate them with a comma, and you're all set!

Written by Antoine Minoux
Updated over a week ago

Why are my emails landing in spam?

This article will address some common problems with outgoing mail landing in spam.

Written by Nate
Updated over a week ago

Gmail SMTP FAQ

Frequently asked questions and issues regarding Gmail SMTP and the "send mail as..." feature with your custom domain.

Written by Nate
Updated over a week ago

Error codes returned by ImprovMX’s SMTP servers

Written by Cyril Nicodeme
Updated over a week ago

Why doesn't ImprovMX use MXS domains anymore?

We've recently moved away from requiring premium users using different MX records for simplicity and ease of use.

Written by Cyril Nicodeme
Updated over a week ago

What are the allowed attachments?

Written by Antoine Minoux
Updated over a week ago

Why does ImprovMX need SPF?

The Sender Policy Framework is commonly used for service that sends emails. With email forwarding, we need you to add us to your SPF.

Written by Cyril Nicodeme
Updated over a week ago

Some emails are refused because of Spamhaus, why?

We're using Spamhaus to detect spam emails and protect our email deliverability. Learn how to troubleshoot issues you might having.

Written by Antoine Minoux
Updated over a week ago

What does “Invalid DKIM signature” mean?

You may have received feedback from someone trying to send you an email which was refused with a message related to DKIM signature.

Written by Antoine Minoux
Updated over a week ago