Sending and verification credits
Buy add-on credit packs, understand why they carry over when your plan allowance does not, and know when a pack beats an upgrade.
On this page›
What credit packs are for#
Credit packs are a one-off top-up you buy on top of whatever plan you are on. This page covers the two kinds, the order in which they are consumed, and the one mechanic that decides whether you should buy a pack or change plan.
The two kinds of pack#
Sending credits add emails you can send. They come in packs of 10,000, 50,000 and 250,000.
Verification credits add addresses you can check with Email verification. They come in packs of 5,000, 25,000 and 100,000.
The two are separate pools. Sending credits cannot verify an address, and verification credits cannot send an email. Buying one does not affect the other.
A pack is a purchase, not a subscription change. Your plan, its price and its monthly allowance all stay where they were.
The mechanic that matters#
Read this part twice, because most billing surprises come from missing it.
Your plan's monthly allowance resets at the start of each billing cycle and does not carry over. If you are on Pro with 200,000 emails a month and you send 60,000, the remaining 140,000 disappears at the rollover. You do not bank it.
Purchased pack credits do carry over. Credits you paid for and did not use are still there next cycle, and the cycle after that.
And the consumption order follows from that:
- Your plan's monthly allowance is used first.
- Pack credits are drawn on only once the allowance is exhausted.
That order is the sensible one. It spends the thing that is about to expire before it spends the thing that keeps. It also means a pack you buy as insurance can sit untouched for months and lose nothing, which is exactly what you want from insurance.
What this looks like in practice
Starter gives you 50,000 emails a month. You buy a 50,000 sending pack in March but only send 44,000 that month, all of it out of the plan allowance. The unused 6,000 of plan allowance vanishes at the rollover. The full 50,000 pack is still sitting there in April.
Buy a pack#
Check what you actually need
Look at the remaining allowance on Dashboard and at the size of the send you are planning. Buy the size that covers the gap. Packs carry over, so buying slightly too much costs you nothing but cash flow, while buying too little means going back for a second one mid-campaign.
Open the billing section of your account
Sign in at https://mail.igsendmail.com and open billing in the account area.
Choose the pack and confirm
Pick the sending or verification pack you want and complete the purchase. Credits are added to your account, on top of the plan allowance you already have.
Confirm the balance before you send
Check that the balance reflects the purchase before you queue a large campaign. If it does not appear, contact support rather than buying a second pack.
Pack or upgrade#
The two solve different problems, and picking the wrong one is expensive in either direction.
Buy a pack when the month is unusual. A product launch. A conference follow-up. A one-time announcement to your whole list, including the segments you normally leave alone. A list you inherited and need to verify in one pass before you mail it. In all of those the extra volume is a spike, not a new baseline, and moving your plan up for one month means either paying the higher rate afterwards or remembering to move it back down.
Upgrade when the volume is the new normal. If you have gone over your allowance two or three months running, you are not having unusual months, you have grown. Repeated packs on top of a small plan cost more than the plan that fits, and every one of them is a purchase you have to remember to make before a send rather than something that renews on its own.
A rough test: if you expect to buy the same pack again within the next two months, buy the plan instead.
| Signal | Pack | Upgrade |
|---|---|---|
| One campaign pushed you over | Yes | No |
| Third month in a row over the limit | No | Yes |
| One-off cleanup of an inherited list | Yes | No |
| Your list is growing every month | No | Yes |
| You want a buffer that never expires | Yes | No |
Verification credits specifically#
Verification is charged per address checked, and Email verification returns one of three results per address: deliverable, undeliverable, or risky. You are charged for the check regardless of which result comes back, so an undeliverable address still consumes a credit. That is the point of doing it, you are paying to find out.
Two habits keep the cost down:
- Deduplicate a list before you verify it. Paying twice to check the same address is a common, avoidable waste.
- Verify a list once, on import, rather than re-verifying a clean list before every campaign. Bounce handling suppresses hard-bounced addresses for you as you send.
If you are about to verify a list larger than your remaining verification allowance, buy the pack first. A verification run that stops halfway leaves you unsure which addresses were checked.
Last updated September 10, 2026