maildoso Reviews & Product Details

Nothing! Maildoso's customer support is horrible. Review collected by and hosted on G2.com.

I paid $75 on 7 October. Almost three weeks later I still couldn’t use the service.

There was no onboarding. Nothing at checkout or in the welcome email said that using domains needed a separate subscription. I learned each requirement only by asking and then waiting for a reply.

The answers contradicted each other, sometimes on the same day:

The AI support agent said my payment probably hadn’t linked to my account and asked for a receipt the company already had.

One agent told me to click “Connect existing domains” under a “Domains” menu on the left. That menu doesn’t exist.

Another said I needed a separate Domains subscription to use domains at all.

One agent said my plan covered 30 mailbox slots. A later reply said 10.

The most important detail came only after I pushed for it: connecting a domain overwrites its MX records and breaks any live mailboxes with your current provider. Existing mailboxes also can’t be migrated. Anyone whose domains already carry business email needs to know this before paying, not weeks later.

When I followed up a day after sending the requested domain list, I still had no confirmation that setup had started.

Recommendations to others considering Maildoso:

Before paying, get written confirmation of exactly what your plan includes: mailbox count, whether domains cost extra, and setup steps. Only use fresh secondary domains bought for cold outreach, never domains with live mailboxes. If you want guided onboard Review collected by and hosted on G2.com.

I am the Partner and CTO at Empiric Infotech LLP, and our team started using Maildoso in September 2026 while setting up a small email pilot. After comparing providers for our requirements, it was the best fit for our private SMTP mailbox setup. We now have 12 Maildoso mailboxes across six separate domains. We have provisioned the mailboxes, checked the domains' mail records, retrieved the mailbox connection details, and connected two mailboxes to Reply.io for our initial integration checks. Having the domains, DNS setup and mailboxes managed in one place makes this easier to organize. My positive rating is based on this initial setup experience. We have not yet measured campaign performance or long-term inbox placement.

Disclosure: Maildoso offered 10 free SMTP mailboxes for publishing an honest review. Review collected by and hosted on G2.com.

The initial setup could explain small mailbox add-ons and third-party connection settings more clearly. When we wanted to grow from 10 to 12 mailboxes, the add-on options were not obvious to us, although we later added the two mailboxes. Our Reply.io integration also needed careful checking of the SMTP port and SSL settings; port 465 with SSL worked for the two mailboxes we tested. I would appreciate a clearer guide for that exact setup and a billing view that separates monthly mailbox charges from annual domain renewals. Review collected by and hosted on G2.com.

To their credit, once I escalated the issue Maildoso acted fairly on the money side: they cancelled all subscriptions and issued a full refund of everything I had paid. So on billing, the matter was ultimately resolved correctly, and I want to acknowledge that. Review collected by and hosted on G2.com.

The core problem is the product itself. Every domain I received was already on the SURBL ABUSE blacklist — I checked 6 of 6, including one that had never sent a single email, which means it was blacklisted before I ever used it. The result: mail-tester scored 8.2/10 with a URIBL_ABUSE_SURBL penalty and my emails went straight to spam — regardless of warmup or domain age. The identical email sent from my own clean domain scored 10/10 and landed in the inbox. The product is marketed for cold outreach, yet these domains were unusable for exactly that purpose.

Support was also very slow: replies took more than 24 hours, and there was no response at all on weekends — which makes a time-sensitive deliverability problem hard to resolve.

Getting a refund fixes the money, but it does not change the fact that the domains couldn't reach the inbox. I'd encourage anyone considering Maildoso to check the SURBL/blacklist status of the domains before sending. In principle Maildoso should provide ready-to-use infrastructure for cold email. In my case it did not solve that problem — the domains couldn't reach the inbox, so the core value (deliverability) wasn't there, and support responses were slow (24h+, none on weekends). On the positive side, the refund was handled in full after I raised the issue. Review collected by and hosted on G2.com.

I really like Maildoso because it's a one-stop shop for all our email infrastructure needs, especially for setting up domains. They've made everything very simple, from the interface to the login process. Their support is fantastic, as they respond immediately and solve issues promptly, and if not, they get back to us within 24 hours. We also find the domain setup feature particularly useful since it consolidates everything in one place. Overall, setting up Maildoso was super easy. Review collected by and hosted on G2.com.

I probably will say if we had an interface that we can say we could have different types of emails with different numbers, that will be great. Otherwise, we are happy with the platform. Review collected by and hosted on G2.com.

Maildoso solves a real problem. One of the best campaign results I’ve gotten came from using Maildoso’s accounts. Review collected by and hosted on G2.com.

So far, I haven’t run into any problems. The only thing I’d mention is that I used to be a GW user, and in my email accounts I had a profile picture and everything, which instantly gave a more human-like vibe. I’m not sure if that really matters, but it might add a small trust factor. Either way, I don’t really care. Review collected by and hosted on G2.com.

We switched from Inboxkit to Maildoso after another agency recommended it to us. During the first month, after warmup, our reply rates were around 1.5x-2x higher than what we were normally seeing before. What surprised me most is the stability after that initial period.

At one point some mailboxes burned, so we paused campaigns for about 2 weeks. After restarting, performance actually improved instead of getting worse. Since then, the infrastructure has been running very consistently for us without needing constant maintenance or rebuilding inboxes every other week. Review collected by and hosted on G2.com.

The beginning was a little stressful because a few mailboxes burned during the first month, and we weren’t sure if we would have to repeat the whole setup process again. The dashboard could also be a bit clearer in some sections. Review collected by and hosted on G2.com.

I have been using it for a year already. Out of all SMTP providers, this one is the best. First of all, I want to say – SMTP often shows higher results than GW or MS 365. The claim that SMTP allegedly works worse is tales told by sequencers, as it is important for them to attract clients with GW/MS mailboxes. In reality, spam filters do not care about SMTP – millions of emails (service, transactional, opt-in) are sent from SMTP, and nothing lands in spam. Review collected by and hosted on G2.com.

I liked everything. There are no complaints. The only thing that can be fixed is onboarding. Review collected by and hosted on G2.com.

We run outreach for several clients at the same time, so keeping everything organized is important. What I like most is that we can manage different sending environments without creating extra work for the team. Over the last 4 months, we've scaled from 12 to 38 active mailboxes and the process has been fairly smooth. Review collected by and hosted on G2.com.

There are a few sections where I wish there were more explanations for newer users. We figured things out after a while, but some features could be easier to understand on day one. Review collected by and hosted on G2.com.

We started using Maildoso a few months ago for outbound campaigns and it has made inbox management easier for our team. I like that we can keep multiple sending accounts in one place without spending too much time setting everything up. The onboarding process was simpler than expected and we were able to start campaigns fairly quickly. Review collected by and hosted on G2.com.

The dashboard can feel slightly cluttered after adding more inboxes, especially when switching between accounts. Support has been decent overall, but there were a few moments where responses took longer than expected. Review collected by and hosted on G2.com.

The service is incredibly fast. Tasks that used to take me 2-3 days of manual setup now take just 10 min. I’ve tried other providers and tested both GW/MS365 accounts, but they also took 3 days to get ready. Maildoso massively speeds up our onboarding for new clients. And with their API/MCP, I don’t even need to log in to the dashboard – I can just add maildoso directly to our ai system. Pricing is fine, either at the market average or lower. Review collected by and hosted on G2.com.

Deliverability can be unstable during the first 3-5 days after the launch. My recommendation is to wait 2 weeks minimum – that gives the mailboxes enough time to build up a strong reputation, so they’ll be active for a long time (up to 6 months). Review collected by and hosted on G2.com.