How to recover sender reputation after a drop

[Mailer Contact]

Hello community

I’m hoping someone here has faced this before. For the past few months my campaigns in Mumara Campaigns were performing pretty well. My open rates were usually around 20–23%.

But over the last two weeks things dropped badly:

• Open rate went down to 6–8%
• Gmail placement seems worse
• Campaigns are taking longer to complete

Nothing major changed on the infrastructure side, so I’m worried my sender reputation dropped.

My questions are:

• What’s the correct way to recover sender reputation?
• Should I stop sending completely or continue with smaller campaigns?
• Any best practices specific to Mumara Campaigns or MumaraONE?

Would appreciate any real-world advice.

 

[Christian Goliath]

Usually this happens to almost every sender at some point.

The good news is that sender reputation can be recovered, but it requires a controlled approach.

Based on real scenarios I’ve seen with Mumara Campaigns and MumaraONE, recovery usually involves three steps:

1. Identify what caused the drop
2. Reduce sending risk temporarily
3. Rebuild engagement gradually

Let’s walk through this practically.

 

[Mailer Contact]

That sounds reasonable.

How do I figure out what caused the reputation drop in the first place?

 

[Christian Goliath]

Start by checking your last 3–5 campaigns inside Mumara Campaigns.
Look for these signals:

• Did you send to older inactive segments?
• Did the list size suddenly increase?
• Did complaints or unsubscribes spike?

In many cases I’ve seen, the issue starts when someone sends to a large inactive segment.
Example I saw recently:

Campaign	Audience	Open Rate	Result
Weekly Newsletter	Engaged segment	22%	Normal
Promo Campaign	Mixed segment	14%	Slight drop
“Full list test”	Old + inactive users	6%	Reputation impact

Inbox providers watch engagement trends, not just one campaign.

 

[Mailer Contact]

Thats Interesting. I did run a campaign to my entire database recently to “wake up” inactive users.

That might explain the drop.

 

[Christian Goliath]

Yes that’s a very common trigger.

Here’s how I normally recommend recovering reputation using Mumara Campaigns.

Pause Risky Segments
Immediately stop sending to:

• Users who haven’t opened in 90+ days
• Newly imported contacts
• Any questionable lists

Send only to your most engaged segment.

Example segment in Mumara Campaigns:

Opened OR clicked in last 30–60 days

 

[Mailer Contact]

So basically focus only on engaged users for a while?