Email deliverability

Antoine Minoux avatar Cyril Nicodeme avatar Nate avatar
11 articles in this collection
Written by Antoine Minoux, Cyril Nicodeme, and Nate

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.
Nate avatar
Written by Nate
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.
Antoine Minoux avatar
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!
Antoine Minoux avatar
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.
Nate avatar
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.
Nate avatar
Written by Nate
Updated over a week ago

Error codes returned by ImprovMX’s SMTP servers

Cyril Nicodeme avatar
Written by Cyril Nicodeme
Updated over a week ago

Why ImprovMX doesn’t use MXS domains anymore?

We've recently moved away from requiring premium users using different MX records for simplicity and ease of use.
Cyril Nicodeme avatar
Written by Cyril Nicodeme
Updated over a week ago

What are the allowed attachments?

Antoine Minoux avatar
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.
Cyril Nicodeme avatar
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.
Antoine Minoux avatar
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.
Antoine Minoux avatar
Written by Antoine Minoux
Updated over a week ago