MailerZ

MailerZ is a custom-domain forwarding and SMTP delivery service for people who want to use their own domain with existing mail apps or applications. It suits domain owners, founders, support teams, agencies, and small businesses that need controlled routing rather than a conventional hosted inbox. Its strongest case is combining forwarding, authenticated sending, and useful delivery records, provided the plan’s quotas and retention fit your workload.

Overview

MailerZ receives mail for verified domains, forwards it to existing inboxes, and sends outbound messages through authenticated SMTP. Setup involves verifying domain ownership, pointing MX records to MailerZ, creating aliases and destinations, and connecting SMTP credentials. Catch-all forwarding, multiple recipients, outbound replies, and send-as workflows are supported on the service, while the Free plan disables sending features.

The hosted Mail Box at mail.mailerz.net offers Inbox, Sent, and New email views, along with held and forwarded streams. It is a useful control surface for routing and recovery, but MailerZ is not an IMAP or POP mailbox host, permanent archive, campaign sender, or Gmail replacement. Forwarded messages preserve the visible original sender; SRS changes only the envelope, which helps recipients recognize who actually wrote the message.

Key features

Routing and sending

Aliases can deliver to existing inboxes, and SMTP credentials are limited to approved identities. This separation is practical for websites, applications, and teams that need domain-based sending without handing over a full mailbox account. SMTP and API access begin with the Solo plan; Free is forwarding-focused and keeps unrouted mail on hold or rejects it.

Delivery records and recovery

MailerZ records whether a message was forwarded, held, bounced, or rejected, including delivery codes and explanations. Messages are stored before SMTP 250 acceptance, giving failed deliveries a recovery path. Recovery lasts 14 days on Free, 90 days on paid plans other than Unlimited, and 180 days on Unlimited, so it is operational protection rather than long-term retention.

Security and compliance

Domain verification is required for receiving and sending, and SMTP credentials are scoped to approved identities. MailerZ states that it is not SOC 2, ISO 27001, or HIPAA certified. Regulated organizations should therefore assess whether those certifications are mandatory before adopting it.

Pricing

MailerZ is freemium, with a 7-day trial and paid plans from $3.33/mo when billed annually. The plans differ sharply in sending access, seats, domains, aliases, quotas, and retention.

Plan	Price and allowances
Free	free; 1 domain, 3 aliases, 1 seat, 14-day store. Send-as, SMTP, and API are disabled; unrouted mail is held or rejected.
Solo	$40 a year, annual only; 3 domains, 15 aliases, 1 seat, 90-day store, 1,000 outgoing emails/month and 5/hour. SMTP and API enabled.
Starter	$880 a month, monthly or yearly; annual billing includes two months free. 5 domains, 50 aliases, 5 seats, 2,000/month and 10/hour, with SMTP and API.
Business	$19,190 a month, monthly or yearly; annual billing includes two months free. 25 domains, 200 aliases, 25 seats, 4,000/month and 15/hour.
Agency	$39,390 a month, monthly or yearly; annual billing includes two months free. 100 domains, 500 aliases, 50 seats, 8,000/month and 25/hour.
Unlimited	$99,990 a month, monthly or yearly; annual billing includes two months free. Unlimited domains, aliases, and seats, 180-day store, 100,000/month and 300/hour.

Solo is the logical paid entry for one person needing SMTP/API and a few domains. Starter and Business target growing teams through additional seats and aliases, while Agency is aimed at multi-client operations. Unlimited is for exceptionally high-volume, multi-domain organizations; its price demands a workload that genuinely uses those ceilings. Free is suitable for basic forwarding experiments, but its three-alias cap and lack of outbound access make it unsuitable for a sending workflow.

Platforms

MailerZ provides web access and an API. It works with Gmail, Outlook, Apple Mail, Thunderbird, websites, and applications that support SMTP, so it can sit behind existing clients rather than requiring a platform switch.

Who it's for

Choose MailerZ for personal domains, founders, small businesses, support teams, agencies, multi-domain teams, and approved websites or apps that need forwarding plus authenticated sending. Look elsewhere if you need a conventional mailbox host, permanent archive, marketing campaigns, or certification-backed compliance.

Pros and cons

Pros

• Preserves the visible original sender while using SRS for envelope handling.
• Delivery states, codes, and explanations make routing failures diagnosable.
• Scoped SMTP identities and pre-acceptance storage reduce accidental misrouting.
• Paid tiers scale from one domain to unlimited domains, aliases, and seats.

Cons

• Free has no SMTP, API, or send-as capability and only 14 days of recovery.
• Paid plans cap monthly and hourly sending, which can constrain bursts.
• It is not a mailbox or permanent archive, limiting its role for users wanting full email hosting.
• Lack of SOC 2, ISO 27001, and HIPAA certification may rule it out for regulated work.

Alternatives

For a broad comparison, see Email Forwarding Services.

• Forward Email is a better fit when open-source software, self-hosting, or wider device coverage matters; its Enhanced Protection plan is $3 a month.
• Haltman mail-forwarding-core suits users wanting free, forwarding-only infrastructure with unlimited rules, users, addresses, domains, and emails.
• Forward is preferable when a free tier with 25 aliases, 500 forwards per day, and seven days of logs is enough.
• ImprovMX is an alternative for a free plan offering 25 aliases, 500 forwarded emails per day, API access, and a 99% uptime guarantee.
• DNSExit Email Forwarding fits users already using DNSExit domains or seeking low-cost address-based plans.
• EForw is worth considering for unlimited catch-all aliases and SPF, DKIM, and DMARC pass on its free tier.
• InboxMail is an option when custom-domain mail is combined with AI actions, campaigns, and agent inboxes.
• KaiMail is a simpler mailbox-oriented alternative with a free custom domain, one mailbox, and 300 emails per month.

Verdict

MailerZ is a strong choice for domain owners and small teams that need dependable forwarding, authenticated SMTP, and actionable delivery records without replacing their existing mail clients. Choose it for controlled routing and sender preservation; look elsewhere if you require full mailbox hosting, permanent retention, campaign delivery, or compliance certifications.