Articles on: Email Deliverability

Email WarmUp

title: Email WarmUp
description: Improve sender reputation by automatically warming up your email account.

Overview


Email WarmUp improves your domain reputation and email deliverability by automatically sending emails, opening them, clicking links, and moving emails from spam to inbox. We have 100,000+ Active email addresses in our warmup pool network.


Prerequisites


  • Active SalesBlink account


  • Email sender(s) connected to SalesBlink


Why Emails Go to Spam


  • Low open rates (<10%)


  • Low reply rates (<2%)


  • Emails consistently landing in spam


  • Spammy subject lines or content


  • Technical setup issues (SPF, DKIM, etc.)


  • Unsafe or flagged links


How Email WarmUp Works


When enabled:


  • SalesBlink sends emails between addresses in the WarmUp network


  • Emails are opened, links clicked, and replies sent


  • Emails are moved from Spam to Inbox


  • All activity happens automatically while your sender is connected


  • Improves reputation for everyone in the pool



  • New domains: Wait for 30 days before sending cold emails
  • Older domains: 15-20 days should be enough


May take longer if:


  • Emails are still going to spam


  • Domain is new


Check Readiness status and Remaining days on the WarmUp Reports page.


Enable Email WarmUp


  1. Go to Outreach → Email Senders


  1. Find your sender and click the WarmUp checkbox




  1. The checkbox turns to a green checkmark when enabled

Note: Email WarmUp is enabled by default when connecting a new sender.


Configure WarmUp Emails Per Day


Recommended Max Daily WarmUp Limit: 30 to 50


Default: 50 emails/day (automatically ramps up)


To increase manually:


  1. Go to Outreach → Email Senders


  1. Click the WarmUp checkbox to open reports




  1. Click the Settings icon




  1. Update Daily Email Frequency (Max: 50)




  1. Click Save


Note: May take up to 24 hours to reflect changes.


Configure Auto Ramp-Up


  1. Enable WarmUp email ramp-up (Auto Ramp Up)


  1. Set:


  • Initial Daily Emails Limit: 1


  • Daily Increment In Emails: 1


  • Max daily frequency




Notes: Daily frequency must be less than Max frequency. It takes up to 48 hours to apply.


Configure Warmup Filter Tag


The Warmup Filter Tag is a unique identifier that is included in all warmup emails sent from your sender. It makes it easy to find, search, and filter warmup emails in your email client.


By default, warmup emails contain hotblink in the subject line. You should replace this with your own custom tag made of two words joined by a hyphen (for example, friendship-fright).


Why the Warmup Filter Tag is important


  • Improved Deliverability: Some ESPs over time might detect hotblink as a spam keyword and negatively impact your email sender's repuration. Using a custom filter tag hence improves the impact of WarmUp on your email sender.
  • Keeps your inbox organized: Warmup emails are generated automatically, so they can quickly clutter your inbox. A dedicated tag lets you filter them into a separate folder or label.
  • Prevents confusion: A unique tag helps you avoid mistaking warmup emails for real prospect replies or important conversations.
  • Enables accurate filtering: Email providers like Gmail and Outlook let you create rules based on words in the subject line. Using a custom tag makes these rules precise and reliable.
  • Per-sender control: Each email sender can have its own tag, but we recommend you keep the same tag for all your senders so that you can automatically update them and create the right filters as well.


How to set the Warmup Filter Tag


  1. Go to Outreach → Email Senders


  1. Open the sender's WarmUp Report


  1. Click the Settings icon


  1. Find the Warmup Filter Tag field


  1. Enter two words separated by a hyphen, or click the refresh icon to generate a random tag


  1. Click Save


Note: WarmUp related updated take up to 24 hours to apply. After changing the tag, update your email client filter to use the new tag instead of hotblink.



Rank

Provider

#1

Google Workspace Gmail

#2

Microsoft 365 Outlook


Other email providers can be a hit or miss, but the best email deliverability can be expected from these two senders only.


Settings for Email Senders


During WarmUp


Send 1 to 2 cold emails per day while the sender is still in WarmUp. (Optional)


After WarmUp Is Completed


Send up to 25 to 50 emails per sender depending on your reply rate:


  • If you have a good reply rate (above 2%), you can go up to 50 per day
  • Otherwise, start with 20 to 25 per day


Auto Ramp Up for Sender


Use Auto Ramp up for the sender with these settings:


  • Initial Daily Emails Limit: 5
  • Daily Increment: 3


Note: Apply these sender settings only after WarmUp is completed.



WarmUp Links make your links look natural and trusted to email providers.


Step 1: Go to Other Settings


  1. Click your Profile icon (top right)
  2. Select Other Settings





  1. Scroll to Email WarmUp Links
  2. Click Add





Complete the Edit WarmUp Link popup:


  • Internal Name — Used inside SalesBlink for identification (e.g., "SalesBlink")


  • Link Label (Anchor Text) — Text that appears in email (e.g., "SalesBlink")






  1. Click Save


Your link will now appear in the WarmUp Links list.



  1. Go to Outreach → Email Senders


  1. Open your sender's WarmUp Report




  1. Click Settings


Step 6: Configure WarmUp Settings


  1. Scroll to WarmUp Links section
  2. Select the link you created (e.g., "SalesBlink")




  1. Click Save


Add WarmUp Email Templates


Warm up real templates used in campaigns.


  1. Create an email template


  1. Go to WarmUp Reports




  1. Select templates in Settings




Notes: Multiple templates supported. Spintax and variables are NOT replaced during warmup.


Advanced Settings


Recommended settings:


  • Open Rate → 70%


  • Spam Protection → 90%


  • Read Emulation → 60%




Note: Modify only if you understand the impact.


View Email WarmUp Reports


Track performance metrics:


  • Emails Sent — Sent in last 7 days to WarmUp pool


  • Emails Received — Received from WarmUp pool


  • Replies Received — Shows engagement → improves trust


  • Spam → Inbox — Emails moved from spam to inbox (key metric for deliverability)




Create Filters for WarmUp Emails


All WarmUp emails contain your Warmup Filter Tag (or hotblink if you have not set a custom tag) in the subject line. Create a filter in your email client to hide these emails from your inbox.


Tutorials:





Similar features are available in almost any email client.


Disable Email WarmUp


  1. Go to Outreach → Email Senders


  1. Open WarmUp Reports


  1. Click Disable Email WarmUp




Warning: Disabling may reduce deliverability and increase spam risk.


Frequently Asked Questions


Q: What time zone does WarmUp use?


Works 24/7, independent of sending hours.


Q: Why is WarmUp not available for my sender?


Not available for SMTP-only email accounts.


Results


Email WarmUp helps you:


  • Build sender reputation


  • Reduce spam placement


  • Improve inbox rate


  • Boost campaign performance

Updated on: 03/07/2026

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