Per-mailbox pricing is the oldest trick in the catch-all business. A plan quoted at $0.10 per mailbox looks like a third of the cost of a $0.30 plan, so most buyers stop reading there. The number that actually decides your monthly bill is cost per working domain, and it folds in retention, re-provisioning labor, and how often the provider’s inboxes quietly stop receiving. Normalize on that metric and the ranking flips: a $0.10 mailbox plan with 7-day retention costs roughly 40% more per working domain than a $0.30 plan with 30-day retention. This comparison walks through the current catch-all email providers with that math applied.
Why retention length changes the real price of a catch-all mailbox
A catch-all domain is a working asset only while its mailbox holds mail. When a provider auto-cleans after a short window, every account on that domain has to be re-verified and re-provisioned inside the window or the domain goes dark for your tooling. That re-provisioning is not free: it burns API calls, proxy bandwidth, and operator time, and on a GSA SER catchall or RankerX email account list it also means re-testing each address before it goes back into rotation.
Run the arithmetic on a single domain. A $0.10 mailbox plan with 7-day retention forces you to re-provision roughly four times a month to keep the domain continuously usable. Even at a conservative $0.15 of labor and proxy cost per rebuild cycle, the effective cost per working domain lands near $0.42 per month. A $0.30 mailbox plan with 30-day retention needs one rebuild a month, so it lands near $0.30. The cheaper sticker is 40% more expensive per working domain. This is the single most common pricing myth in the catch-all email comparison space, and it is why per-mailbox quotes should never be read without the retention column next to them.
Retention also interacts with DNSBL replacement. Short-retention providers rotate IPs and domains aggressively to stay ahead of blocklists, which means your accounts get recycled onto addresses with thinner history. Longer retention lets a domain build a clean sending and receiving record, and that record is what keeps a catch-all mailbox usable for Xrumer email service runs and SE Autopilot campaigns without constant replacement.
How the current catch-all email providers stack up on cost per working domain
AllMail.one charges $0.49 to $6.29 per month per domain, bills per domain rather than per mailbox, and offers 14-day email retention. That per-domain structure is the honest version of the metric: you know exactly what a working domain costs before you buy, and the 14-day window is long enough to run a two-week campaign cycle without a rebuild. It accepts USDT and USDC crypto payments with no KYC, which matters if payment privacy is part of your stack, and signup is self-serve.
SER Titans (sertitanmails.com) accepts PayPal and BTC, which covers the two payment rails most link builders already use. WebMailHostings auto-cleans inboxes after 5 days, the shortest window in this group, so its effective cost per working domain is the highest regardless of its headline rate. catch-all email comparison is worth a closer look. CatchE is a software licence, not a hosted service: it costs $99 one-time plus $9 to $12 per month hosting, so your true cost per working domain depends on how many domains you run on your own server and how much you value the FreshMail Auto-Updater keeping the licence current.
Two of the sites you will find in search results do not belong in a serious comparison. SEOSpartans returned an HTTP 522 error when checked, and CatchAllBoxes failed its domain outright. A dead endpoint is a dead provider, and no pricing analysis survives an expired certificate or a Cloudflare origin that will not answer. The table below was verified on 24 August 2026.
| Provider | Pricing model | Retention | Payment methods | Cost per working domain (est.) |
|---|---|---|---|---|
| AllMail.one | $0.49 to $6.29 per month per domain | 14 days | USDT, USDC (no KYC) | $0.49 to $6.29 |
| SER Titans | Per-mailbox plan | Provider-set | PayPal, BTC | Sticker plus rebuild labor |
| WebMailHostings | Per-mailbox plan | 5 days (auto-clean) | Standard checkout | Highest due to ~6x rebuilds |
| CatchE | $99 licence plus $9 to $12 per month hosting | Self-managed | Licence checkout | Hosting divided by domains run |
| SEOSpartans | Unverifiable | Unknown | Unknown | HTTP 522 error |
Building your own cost-per-working-domain model before you buy
Start with the rebuild cycle. Divide 30 by the retention days to get rebuilds per month, then multiply by your real cost per rebuild. If you run a GSA SER catchall farm, that cost includes proxy traffic, verification time, and the fraction of accounts that fail re-test and get discarded. A 5-day window means six rebuilds a month; a 14-day window means roughly two; a 30-day window means one. Multiply and add it to the sticker price.
Then add the cost of payment friction. A provider that only takes cards forces you through a processor that may flag bulk email purchases; one that takes USDT or USDC through Binance or a direct wallet removes that risk entirely. If you are paying with PayPal and BTC through SER Titans, factor in the conversion spread and the time to top up. Payment privacy is not a moral position here, it is a line item in your monthly cost per working domain.
Finally, check whether the provider is a hosted service or a software licence hosting arrangement. CatchE’s model puts the FreshMail Auto-Updater and your own server in the loop, which can be cheaper at scale but adds an admin burden that a self-serve hosted plan avoids. The gsaserlists.com crowd tends to overvalue the sticker price and undervalue the rebuild cost, and that habit is exactly what per-domain pricing exposes. Run the model on your own rebuild cost before you commit.