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Tips & Tricks: Improve your email campaign delivery speed

Delivery Speed

Delivery speed refers to how quickly your sent emails actually arrive in your recipients' inboxes.

A slow campaign delivery is more common than you might think, and it can seriously impact your results — especially when timing matters. Whether you're running a flash sale, a product launch, or an event reminder, getting your emails delivered quickly is key. Here are a few tips on how to improve your campaign delivery speed:

Warm up your domain 🔥

New domains have no sender reputation. Sending large campaigns immediately signals unusual volume to receiving servers, which can trigger delays or blocks.

If your domain is new or hasn't been used for bulk email before, start with small sends and increase volume gradually over several weeks. This builds a positive sending history with email providers before you need to send at scale.

Next Steps: Learn how to warm up your domain.

Be thoughtful of your sender reputation 🐍

Receiving servers run incoming mail against spam filters that evaluate dozens of signals. A poor sender reputation causes delays; a flagged domain can result in messages being blocked entirely.

To maintain a strong reputation:

  • Send only to opted-in subscribers who are familiar with your brand. Unsolicited mail generates complaints and damages reputation quickly.
  • Keep email file size under 102KB. Files over this threshold slow processing, increase transmission time, and cause Gmail to clip your message — hiding your content and CTA behind a "View entire message" prompt.
  • Maintain brand consistency between your emails and website. Inconsistency is a spam signal.
  • Test all links before sending. Broken links and URL shorteners are both red flags for spam filters.
  • Write accurate subject lines. Clickbait language, excessive punctuation ("Urgent!!!"), and all-caps are common spam filter triggers.

Personalise & segment your list 🎯

Targeted sends consistently outperform full-list sends on delivery speed and overall deliverability. Engagement metrics — opens, clicks — feed directly into sender reputation. Sending irrelevant content to disengaged subscribers lowers those metrics and degrades your standing with providers over time.

Use segments to match content to the right audience. Use merge tags (e.g. first name) to personalize where relevant. Avoid sending to your full list unless the content genuinely applies to all recipients.

Learn More: Tips & Tricks to Improve Your Email Deliverability

Be mindful of your campaign size 📋

Sending to a very large list simultaneously can trigger rate limiting from ISPs and spam filters. . If our system detects too many temporary bounces, it may automatically "back off" slightly to protect your sender reputation and avoid emails being rejected. This is a good thing — it helps keep you in good standing with providers and improves deliverability for everyone on the platform.

Sending a large campaign soon? Here's a handy checklist to help you prepare.

A few more things to keep in mind

Sometimes delays are outside your control. Email providers can have their own issues, and some servers have strict firewalls or spam filters that can slow things down. If an email is temporarily rejected by a recipient's provider, don't worry — our system will keep retrying for up to 72 hours. ⏱️

 

As always, reach out to us at support@encorepro.com with any questions!