Bluehost Web Hosting Help

Email Deliverability Problems

We live in a world where spam filters have to exist. But sometimes spam filters can get in the way of legitimate correspondence. If you find some of your emails end up in your recipient's spam folder, arrive late, or sometimes don't arrive at all, this article can help you improve the deliverability of the messages you are sending.

Problems with Email Lists, Newsletters, and Campaigns

Bluehost email servers are designed for personal and professional correspondence, not marketing or promotional email. If you do send out to an email list, it's important that you use an EMS (Email Marketing System) such as Constant Contact, even if it's just a small newsletter. It's risky to manage an email list manually on your own. Laws like the CAN-SPAM Act and CASL set time limits on opt-out requests, and strict requirements for information disclosure and the privacy of users. Violation of these laws carries with it heavy penalties. A simple mistake can lead to a disruption of your email services, your domain name getting blacklisted, or worse.

If you use an Email Marketing System like Constant Contact however, the system will keep you well within the applicable laws and best practices leaving you to promote your cause worry free. Email Marketing Systems can give you crucial analytics so you can see how effective a campaign is, do A-B testing, and see what works while maintaining the highest possible delivery rates for your campaigns. For more information on how to leverage the right tools for email marketing, see Getting Started with Email Marketing.

Problems with Personal Correspondence

If your domain name is never used as part of an email marketing campaign and your emails are sometimes having deliverability issues, it's possible your messages are being blocked by the incoming email filter of the recipient, or an outgoing email filter.

Incoming Email Filters

  • Check Your SPF Record. SPF is a type of DNS record that notifies the recipient's mail host which mail servers are authorized to send email from your domain name. Most modern spam filters take the SPF record into account when determining if a message should be marked as spam or disregarded altogether. To find out more about SPF records and how they can be implemented at Bluehost, see SPF Records.
  • Use Links Sparingly. Links increase the risk of being flagged by a spam filter. This is especially true of shortened links which are often used by spammers as a way to hide domains or keywords that would otherwise trigger filters.
  • Simple Signatures. Keep your email signatures simple. Spam filters will look for problems with HTML code, extra tags, and HTML code copied from Microsoft Word. If you choose to include an image, be sure that the most important parts of the signature (like contact information) are text-based only. Some email clients, like Gmail, don’t display images by default.
  • Limit Attachments. Keep your attachment size and quantity low whenever possible. A majority of email and web communication is done via phones and mobile devices which have limitations for bandwidth and speed. Outgoing messages can be up to 35MB in size; however, many hosts limit to incoming messages to 25MB or less. If large or many files do need to be sent via email, sometimes it’s best to upload the file to your hosting account and email a link to the files, rather than attaching them to the message.
  • Be Careful with Forwarders. Forwarded email is typically treated with more scrutiny than regular correspondence. It's best to use email forwarders for only Bluehost hosted addresses to other Bluehost hosted addresses. You can setup a forwarder to forward messages automatically to an external email address, but doing so is often harmful to the domain name's reputation. If any spam messages are forwarded, rather than the original sender being marked as spam, the Bluehost forwarding address would be regarded as sending the spam, which can affect your overall deliverability rates. If you are forwarding messages to a Gmail account, consider using Gmail POP3 as an alternative. If you are forwarding messages to another external email host, consider accessing your messages with an email client or webmail.

Outgoing Email Filters

Malware and keyloggers are used by hackers and spammers to steal email usernames and passwords from computers and email applications. These email accounts are then used to send out as much spam as they can. One compromised email account can ruin the sending reputation of an entire domain name or even an entire email server. This can lead to a severe service interruption while we work with other hosts to remove the server from their blacklists — which can take anywhere from weeks to months.

One of the ways we protect your email accounts from this kind of attack is through the use of outgoing spam filters. The filters we use rely on a variety of reports we receive from other hosts. If a large number of emails are marked as spam or junk by the recipient, we receive an abuse report with information about it. We also receive the failure notices from emails sent to non-existent addresses. Our system will then analyze those reports to determine what content or sender the reports have in common. Our outgoing spam filters only take action on emails with content or a sender that has been confirmed to be spam by several independent reports. This way, the filter can protect your domain name and our mail servers from blacklisting, without interrupting legitimate personal correspondence.

If you are having email deliverability problems and you suspect an outgoing filter may be the cause, or if you suspect an email account you use has been compromised, please update your email password immediately, and contact our Support team at 844-303-1810 or via Live Chat for further assistance.

Knowledgebase Article 252,961 views bookmark tags: delivery email filters receiving sending working

Was this resource helpful?

Did this resolve your issue?

Please add any other comments or suggestions about this content:

Recommended Help Content

How to Delete a Mass Amount in an Email Account

There are a large number of emails or spam that need to be deleted from an email account.

Email not sending from Client or Webmail

Trying to send out emails from multiple email accounts fail from both webmail and third party email clients. Possible Reasons: The maximum emails per hour has been exceeded. This can be caused by forw

Email Returned Error - Speed Limit Exceeded

Why do my email messages keep getting returned?

Related Help Content

Accessing your Spam Folder

General Instructions on how to use the spam folder with webmail

Accessing the Mail Folder in the Control Panel

This article will explain where email is stored in your system directory.

Spam Hammer

How does Spam Hammer work?

Spam Prevention

Explanation of how spam works and common prevention tips

Email Delay

Is your email being delayed? This article can help you find the source of the problem.

Eliminate Spam

Getting spammed? What does Bluehost recommend?


Oh spam, sometimes it seems like we'll never get rid of you.

Hiding email address from harvester bots, spiders, etc.

I am having problems with being spammed. I believe that my email address has been harvested (taken off my site and sold to spammers). Can I hide my email address, but still have people email me?