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Best Practices for Sending Internal Emails

An image of an email icon on a dark backgroundHow to improve internal email deliverability

Despite new messaging platforms popping up from time to time, email remains the go-to channel for corporate correspondence.

That doesn’t mean, however, internal email communication is operating at an optimal level. Poor habits and unexamined strategies can have a negative impact on email deliverability.

When internal emails land in junk folders, the business suffers. Critical information gets ignored. Deadlines get missed. Opportunities get lost. Employee engagement, along with company morale, declines.

Following best practices helps ensure every internal message arrives where it belongs: the employee’s inbox.

What is internal email deliverability?

Internal email deliverability is a company’s ability to effectively transmit bulk emails to its employees.

It requires navigating technical checks within the organization’s email system and maintaining a credible sender reputation to prevent the system from redirecting messages to the spam folder.

Overall, internal email deliverability comes down to thoughtful execution. Simply drafting a note and hitting the send button isn’t enough to guarantee the email gets delivered to the right place.

What affects email deliverability?

Below are common problems that prevent internal emails from reaching their intended destination, followed by tips on how to fix email deliverability:

Poor list management

  • The problem: Sending a message to an outdated or non-existent email address will hurt deliverability. If your intended recipients aren’t engaging with your emails on a routine basis, your email filter system may start sending those messages to spam and junk folders. This, in turn, will only further damage your deliverability rate.
  • The solution: Keep your distribution lists current. A thorough email list cleanup includes removing the accounts of employees who just left the company. Also, rather than relying on huge bulk emails, consider segmenting recipients into more manageable audiences that fit into distinct categories, such as seniority level or geographical location. And consider using PoliteMail’s Syncronym feature, which automatically updates changes on distribution lists.

Misaligned authentication protocols

  • The problem: If your email lacks domain authentication, a proper security system will identify it as illegitimate and send it straight to junk and spam folders every time.
  • The solution: To ensure your emails are getting delivered, ask your IT department to double-check that your DomainKeys Identified Mail (DKIM), Sender Policy Framework (SPF), and Domain-based Message Authentication, Reporting, and Conformance (DMARC) are set up and working properly.

Sender reputation

  • The problem: An email that looks and sounds like spam isn’t likely to appear in a recipient’s inbox. Certain subject lines and text within the message itself can trigger filters to block the email from getting to where it’s going.
  • The solution: Compose emails that employees want to click on and read. Make the content engaging, relevant, and valuable. Establish and maintain yourself as a credible source of information to avoid the junk folder.

Attachment size limits

  • The problem: Whether it’s a video or whitepaper, if an attachment is too big for your server the email won’t send. Sometimes it may send, but not arrive, prompting a bounce message. Either way, attachment size limits pose a serious hurdle to deliverability rates.
  • The solution: Upload the document to a cloud service, such as Google Drive, or use PoliteMail’s smart attachment feature, which allows users to send large documents by hosting them on PoliteMail’s server. The tool also encrypts the content to make it secure and tracks how many people download it, generating valuable data to inform future decision-making.

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What is a good deliverability rate for email?

While internal communicators who follow the email deliverability solutions outlined above will improve their deliverability rate, it’s hard to say whether that rate is good or bad compared to their peers.

This is where PoliteMail’s 2025 Internal Email Communications Benchmarks Report can help. The report examines data from more than four billion internal emails sent to 12 million employees around the globe. It also breaks down the numbers by 10 industry sectors and seven distribution list sizes so professional communicators can accurately compare their deliverability levels to direct rivals.

PoliteMail metrics break down whether employees actually received the email or not. Beyond that, the metrics reveal if the emails was read based on how much time the recipient spent with the email opened, or if they were simply displayed in the Outlook preview pane and either ignored or deleted.

Armed with this knowledge, internal communicators can make concrete goals to make sure they’re keeping pace with the competition.

How PoliteMail can help improve email deliverability

Many problems with email deliverability stem from the same source: internal communicators using external email marketing software. Adding an outside layer to an organization’s communication process can trigger all kinds of security issues related to privacy, authentication, and how internal email analytics get measured.

Unlike other communication tools on the market, PoliteMail integrates directly into Microsoft Outlook, providing users with a seamless transition. No new apps or platforms are required. PoliteMail’s server also replicates the email and delivers it to each individual mailbox, so you’re able to drill down to see if recipients received it, or if it was bounced back to the sender. This kind of email replication can reveal any breaks in your email delivery protocol, and allow your IT to address any issues.

Because it operates within the familiar Outlook environment, PoliteMail fast-tracks the process of boosting email deliverability while collecting reliable hard data to prove it.

Learn how our internal email software empowers communicators with data-driven insights on employee engagement.

Book your 30-minute personalized demo today!

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