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  1. Validity Help Center
  2. Email optimization
  3. Deliverability

Deliverability

  • FAQ: The Universal Feedback Loop (uFBL)

    How do I get a login for the Universal Feedback Loop? If you are already subscribed to some or al...

  • What is domain warming and why do you need to do it?

    Domain warming is the way you establish a sending reputation for a new domain, or a domain that h...

  • List of all available complaint feedback loops (FBLs)

    Enrolling in feedback loops (FBLs) is an important deliverability best practice, allowing you the...

  • What is a Cloudmark fingerprint and how does it work?

    Cloudmark is a messaging security and anti-spam company owned by Proofpoint. Through their Global...

  • How to identify a Cloudmark spammy fingerprint in Inbox Monitor

    Content containing a spammy Cloudmark fingerprint is usually sent to the spam folder or blocked b...

  • What should I do if my content has a spammy Cloudmark fingerprint?

    If you don't know if your content has a spammy Cloudmark fingerprint, follow the steps listed her...

  • How to warm up an IP address

    Mailbox providers are cautious about the email activity from new IP addresses. Spammers frequentl...

  • How to warm up a domain

    Marketers change sending domains for a variety of reasons, including: A brand change A corporate...

  • ESP Moving Guide

    Switching ESPs is a huge undertaking with impacts across your email program.Validity is here to h...

  • Changing ESPs? Follow these steps to help make the transition go smoothly

    If you are only considering changing ESPs or if you have already made the decision to move to a n...

  • Is there a difference in deliverability performance between an HTML and text-based email?

    Deliverability performance is not determined by the message type: an HTML coded email versus a te...

  • Why are my ESP’s delivery metrics different than my inbox placement metrics with Return Path?

    ESPs typically report the delivery rate, which only tells you the percentage of email you sent th...

  • How to send to dormant subscribers

    How to send email to dormant subscribers is a common question we get from marketers. A general gu...

  • Does using ‘noreply’ in my sending or reply-to address harm deliverability?

    Mailbox providers don’t have filtering rules set up to place your email into the spam folder if ‘...

  • Best practices for increasing sending volume

    Increasing volume in your email program usually involves:  A temporary increase for a special ev...

  • How can I have low inbox placement but a high Sender Score?

    There are several factors that influence or contribute to seeing a high Sender Score and low inbo...

  • Tips for sending to appended email addresses

    Return Path does not recommend sending to email addresses acquired through an email appending lis...

  • Video in Email: Strategy and Planning

    Using video in your email can be an effective way to engage your prospects and customers. Prior t...

  • Video in Email: Best Practices

    Using video in your email can be an effective way to engage your prospects and customers. While f...

  • Why are my inbox placement rates different between mailbox providers?

    Mailbox providers use hundreds of data points regarding your email program to make decisions abou...

  • IP segmentation best practices

    IP segmentation is a popular best practice recommended by many mailbox providers to help improve ...

  • Using IP segmentation to improve deliverability

    Segmenting your IP addresses is the process of separating and sending email traffic from differen...

  • How to perform an A/B split test with the Return Path Seed List

    A/B split testing is a method of comparing two versions of a single email campaign to determine w...

  • Tips for sending to an old email list

    There are times when you may be tempted (or legally required) to mail to an old email list. It is...

  • I send transactional email, how can I benefit most from Return Path tools and services?

    Transactional email is subject to mailbox provider spam filters and require a good sending reputa...

  • Best practices for sending transactional email

    Sending transactional email is a great way to establish and maintain communication with your cust...

  • Troubleshooting tips for transactional email spam folder placement

    Sending transactional email is a great way to establish and maintain communication with your cust...

  • Best practices for sending frequency and cadence

    Frequency and cadence are two important elements to keep in mind when you are creating a sending ...

  • What are the impacts of fluctuating sending volume?

    When you send steady and predictable email volume, mailbox providers can have more confidence in ...

  • What is the difference between spam, junk, and bulk folders?

    The filtering systems used by mailbox providers have methods for classifying email as spam, email...

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