Domain warmup
Warmup starts on its own the first time a domain verifies. There is no button to press and nothing to switch on. Before a domain is verified it has no warmup at all. The card does not appear.1
Find it
Go to Settings, then Domains & senders. Click a verified domain
row to expand it. The Domain warmup progress card is at the top of
the panel.
2
Read the line
It reads like
Day 4 · cap 500/day · 138 sent. Day counts from the day
the domain first verified. The cap is the volume suggested for today.
The sent figure counts email sent from that domain since midnight UTC.3
Send inside the cap
Stay at or under the suggested volume, and send to your most engaged
contacts first. Opens and clicks from real people are what earn the next
step up.
The schedule
The ladder is eleven steps. Each step is one day.What the card shows
Day and volume
Which day of the ramp you are on, today’s suggested cap, and how much
you have already sent from this domain today.
Reputation score
A score out of 100. This row only appears if your workspace has
dedicated sending IPs. On the shared pool there is no per-workspace IP
score to show.
Status
Active in normal operation. Paused means the ramp is not
progressing, which only happens if Senderz stops it.
Faster ramp
A prompt asking whether you are already warm on another provider, with
the request button next to it.
What you can and cannot control
Be clear about this before you go looking for a setting that does not exist.You cannot pause or resume warmup
You cannot pause or resume warmup
There is no pause or resume control in the app. A pausable ramp on
shared sending infrastructure is a foot gun, so the controls are not
exposed. If a domain ever shows Paused, that came from Senderz, not
from something you clicked.
You cannot change the schedule
You cannot change the schedule
The eleven day ladder is the same for every workspace. The only way to
move faster is the accelerated ramp request below, which is reviewed.
You cannot choose a sending IP
You cannot choose a sending IP
Placement on the shared pool is automatic. You can request a dedicated
IP, which is also reviewed.
You control volume, timing and list quality
You control volume, timing and list quality
These are the things that actually decide how warmup goes. Send inside
the cap, send to people who asked for your mail, and clean invalid
addresses out before you send to them.
Requesting a faster ramp
If the domain is already sending real volume through another provider, the eleven day ladder punishes you for switching. Ask for the ramp to be shortened.1
Open the request
On the Domain warmup progress card, next to
Already warm on another provider?, press Request faster ramp. The
domain has to be verified first, and only an owner or admin can ask.
2
Tell us where you are coming from
The dialog asks for two things. Current email provider is the free
text name of the platform you send from today, for example Mailchimp,
Klaviyo or SendGrid. Monthly send volume is roughly how many emails
you send from this domain in a typical month, between 1,000 and
100,000,000.
3
Wait for the review
A person checks it. The card shows
Faster-ramp request submitted. Our team is reviewing it. while that is
happening. You cannot have two requests open at once.
4
Decision
Approved, and the ramp jumps straight to full volume. The card then
reads Established domain. Accelerated ramp. Not approved, and the
reason is shown on the card with a Request again button.
The review is looking for evidence that this exact domain already has a
sending history somewhere else. Name the real provider and give an honest
volume. A domain with no prior history is not made safer by skipping the
ramp, so an inflated number does not help you, it just gets the request
turned down.
Reputation
Senderz pulls reputation data from Google Postmaster Tools and refreshes it every six hours. The score runs from 0 to 100 and feeds the sending IP schedule directly:Outlook reputation through Microsoft SNDS is built but is not live
today, so no Outlook figures are flowing into your scores. Do not plan
around numbers you cannot see on the page.
Sending IPs
By default your mail goes out on Senderz’s shared pool. Each send is placed on the least loaded IP that still has room under its own daily cap. There is nothing for you to configure. Sending IPs run their own warmup, separate from domain warmup. An IP ramps over roughly six weeks and carries its own status: Warming, Active, Quarantined or Retired. The reputation gates in the table above apply to that schedule. You see this on the Deliverability page, in the sidebar under Analytics & insights, on the Sending IP warm-up card. Most workspaces see No dedicated IPs there, which is normal and means you are on the shared pool.Requesting a dedicated IP
A dedicated IP gives you a sending reputation that is yours alone, separate from everyone else on the shared pool.1
Ask
On the Deliverability page, press Request dedicated IP on the
Sending IP warm-up card. Owner or admin only.
2
Fill in the request
Emails per month is required. A short reason is optional but helps.
3
Track it
The button is replaced by Under review and a Withdraw button
while it is open. The outcome shows as Approved or Not approved
with the decision note.
The numbers that decide everything
Two rates carry almost all the weight: how much of your mail bounces, and how many people mark it as spam. The Senderz Score on the Deliverability page is literally 100 minus a penalty for each of them.
The Deliverability page tiles show the protection line as the target, so a bounce tile reads Target below 2%. Treat that as the line you must not cross, and 1% as the number to actually run at.
No rate is judged below 500 sends. A workspace with 40 sends and one
bounce is not a 2.5% bounce rate in any meaningful sense, so it is not
treated as one.
Read the bounce cause before you act
A single bounce percentage tells you almost nothing on its own. The Why mail bounced card splits it:
Only the recipient side causes say anything about your list. A high Blocked share means the problem is reputation, and cleaning contacts will not fix it on its own.
A zero complaint rate can mean “not measured”
If the sending provider is not reporting spam complaints back, the tile shows No data instead of a green zero, with an explanation and a separate count of provider spam rejections. Never read a zero as proof nobody complained. Read the tile.Look at the per provider breakdown
The Breakdown by provider card shows sent, delivered, delivery rate and bounce rate for each recipient mailbox provider. This is the only view that exposes one provider blocking you outright while the rest still deliver. A workspace average will hide it completely.Check each sending domain separately
If you send from more than one domain, the Sending domain health card breaks sent, delivered, bounce rate and complaint rate down per From domain. One bad domain can drag a workspace average without you noticing which one it is.The automatic sending hold
Senderz watches every workspace’s bounce and complaint rates continuously. If yours goes badly wrong, marketing sending is paused automatically to stop the damage spreading.What triggers it
What triggers it
Over the last 24 hours, with at least 500 marketing emails sent, and
either:
- at least 10 permanent bounces, at 2% or more of what you sent, or
- at least 2 spam complaints, at 0.1% or more of what you sent.
What it stops
What it stops
Every marketing send is skipped with the message
Marketing sending is paused to protect your email reputation.Transactional and login messages keep flowing. Order confirmations,
password resets and verification codes are not affected.
How you find out
How you find out
The message names the exact rate and sample size that tripped it, for
example a hard bounce percentage across a stated number of recent
emails. It appears on the campaign as a failure reason, in the send time
error, and in your notifications.
How it is lifted
How it is lifted
It does not lift itself. There is no timer and no self service
switch. Clean your contact list, then contact Senderz support to have
sending resumed.After it is resumed there is a short cooldown, about 30 minutes, before
the next send is accepted. Sends from before the hold are excluded from
the calculation afterwards, so old history cannot trip it again
immediately.
Recovering
1
Work out which rate tripped it
The message tells you whether it was bounces or complaints. They need
different fixes.
2
If it was bounces, clean the list
Open Contacts, then the Suppression list tab. Everything already
suppressed will not be sent to again. Then find where the bad addresses
came from: a purchased list, an old export, or a typo prone signup form.
Remove them at the source.
3
If it was complaints, look at consent
People report mail as spam when they do not remember asking for it.
Check where those contacts came from and how recently they opted in.
See Consent and unsubscribes.
4
Ask support to resume
Say what you found and what you removed. Then restart at lower volume
with your most engaged contacts and build back up.
Keeping it healthy
Import clean
Never import a purchased or scraped list. See
Importing contacts.
Send to people who want it
Engagement is what mailbox providers reward. Segment out contacts who
have ignored you for six months rather than mailing them harder.
Honour unsubscribes fast
Senderz does this for you automatically, but do not re-import contacts
who opted out.
Verify your domain properly
Authentication is the foundation warmup builds on. See
Domains and authentication.
Not available yet
Two things merchants ask for regularly and will not find:- Inbox placement testing. Seed account tests that tell you which folder your mail landed in are planned, not built.
- DMARC aggregate report parsing. Senderz verifies that your DMARC record is published, but does not yet read the reports it collects.