Mailforge:
The Ultimate Review (2026)

Mailforge.ai is a cold email infrastructure provider that is part of the broader "Forge Stack" ecosystem (which also includes Salesforge and Primeforge). According to their official website (mailforge.ai), Mailforge is used by over 10,000 businesses. The platform focuses on providing shared email infrastructure that can be set up in under 5 minutes. They aim to simplify the process of creating hundreds of domains and mailboxes with automated DNS setup, catering to users who need a fast, low-cost entry into bulk sending.

G2: 4.7/5 (81 reviews)
Trustpilot: 3.5/5 (16 reviews)

Real user experiences from Reddit communities (r/coldemail, r/SaaS) highlight some critical concerns regarding Mailforge.ai. Multiple users have reported severe deliverability issues, specifically noting that the shared IP infrastructure causes emails to land in spam. Here are some representative posts:

Just launched mailforge.ai to scale cold email infrastructure in minutes: "SMTP inbox providers like Mailforge are garbage. Terrible deliverability. Your cold emails will go to spam. Gmail, Outlook etc can see that IP addresses of the email servers that Mailforge uses, and will send their emails to spam folder, since the only people using their email servers are spammers."

Zero Responses/OOOs After 500 Sends (Mailforge + Smartlead): "Zero OOOs after 500 sends is a massive red flag that your emails aren't reaching inboxes at all. 50% spam rate on Gmail tests confirms your domains are flagged. Shared IPs through Mailforge might be contaminated from other users burning them."

🟢 Fast setup: Automated DNS configures everything in 5 minutes.
🟢 Ecosystem integration: Works smoothly with Salesforge and other stack tools.

🔴 Shared IP risks: Shared IPs tie your reputation to others. If one user spams, the IP block suffers, tanking your deliverability.
🔴 Higher base cost: At $2 to $3 per mailbox, it costs more than other SMTP options.
🔴 No advanced recovery: Lacks self-healing mailboxes or IP rotation to protect your reputation.

Maildoso is a cold outreach infrastructure provider – we offer domains, SMTP mailboxes, and Google Workspace accounts. The company was founded in August 2023 in Granite Bay, California, by Nikita Bykadarov (Nikita Maildoso).

While other providers offer shared or dedicated IPs, we have developed IP rotation. This means your emails are sent from hundreds of different IPs (making it harder for spam filters to detect a sending pattern), and whenever any IP gets blacklisted, we automatically swap it out for a clean one.

We have also implemented self-healing mailbox technology, which both restores burned-out mailboxes and protects your active email accounts.

The result? As of May 2026, the spam rate across our entire network of mailboxes is around 5%.

G2: 4.7/5 (181 reviews)

"Tried it mainly because of the good price, but ended up sticking with it since deliverability’s been pretty stable so far" – Thinking about trying "Maildoso". Has anyone here used it? Is it actually better than other tools?

"I tested a small batch first and results were comparable to our Google setup. Ended up moving more campaigns there because of the lower cost. That's a good strategy, buy small package and compare with your current setup" – I want to try Maildoso. What do you guys think about it?

🟢 Dynamic IP Rotation: We rotate your IP addresses in real-time – if an IP gets flagged or blacklisted, we instantly swap it for a clean one before your campaign takes a hit.
🟢 Self-Healing Rotation: An automated resting period for mailboxes every two weeks that clears provider flags and recovers reputation on autopilot.
🟢 API & MCP Automation: Create domains and mailboxes, export to your sequencer in one call – or manage it all from your AI assistant through our MCP server.

🔴 Conservative Limits: We suggest sticking to 15 emails a day per box to keep your domains healthy for the long run.
🔴 Google/SMTP Focus: We do not support Microsoft 365/Outlook/Azure environments at this time.
🔴 Lack of built-in warmup. We do not have an integrated warm-up yet, but we are currently working on it.

It’s tempting to choose a provider based solely on the lowest price, but budget infrastructure often leads to hidden costs. When deliverability drops, the consequences usually show up in three areas:

• Burned Leads: High-quality B2B data is expensive. If emails land in spam, those contacts never see the pitch, and the budget spent on data is lost.
• Damaged Domains: Fixing a domain flagged by spam filters can be a massive headache. Often, it’s easier to just buy a new one and start the warm-up process all over again.
• Missed Revenue: Every missed inbox is a missed meeting. In B2B sales, losing even one connection can mean missing out on thousands in closed revenue.

Cold email infrastructure is better viewed as an investment. Maildoso provides the technical tools to protect domain reputation and help keep emails in the primary inbox.

We have looked at Mailforge from all angles, and overall, we cannot recommend it for use.

Mailforge provides the bare minimum features required to launch cold outreach campaigns. The cost per mailbox ranges from $2 to $3 (which, on average, is several times more expensive than the market standard), and you only get shared IPs for that price.

If you choose to purchase mailboxes from them, they will likely work. However, there are many other, far more attractive offers available on the market.