SMTP Zen Email Forwarding

SMTP Zen Email Forwarding sends messages addressed to custom domains into inboxes you already use, so each address does not need its own mailbox. Named forwarding addresses and catch-all rules can be managed across multiple domains. Forwarding covers inbound routing only; sending as the custom domain requires a hosted mailbox because forwarding does not provide an inbox or authenticated outbound SMTP. Setup involves adding a domain, following displayed DNS instructions, creating rules, and testing receipt. SMTP Zen documents SMTP, IMAP, and POP settings, plus instructions for iOS and Android mail apps. Developer examples cover Node.js, Python, PHP, Ruby, and Go through port 465 with implicit TLS or port 587 with STARTTLS. Hosted mailboxes include Crossbox webmail, unified inboxes, search, keyboard shortcuts, calendar, and contacts. Plans start at $1.20/mo, with a 2-day trial on most plans; custom plans may be excluded.

SMTP Zen combines custom-domain forwarding with optional hosted mailboxes and documented developer connections. Check the mailbox requirement if you need to send as your domain, and review usage restrictions before choosing a plan.

It suits developers sending app email, small teams, freelancers managing client domains, and domain investors. It also fits users needing forwarding across multiple custom domains.

Overview

SMTP Zen Email Forwarding routes mail sent to custom-domain addresses into inboxes you already use, without requiring a mailbox for every address. It suits developers, freelancers, small teams, and domain investors who want domain-based inbound routing, with hosted mailboxes available when they also need to send as the domain. The key distinction is that forwarding alone does not provide an inbox or authenticated outbound SMTP.

Key features

Named addresses and catch-all rules cover both deliberate aliases and mail sent to otherwise unconfigured addresses. Rules can be managed across multiple domains, which is useful for client work or a portfolio of domains; unlimited domains and bandwidth are included in the listed mailbox plans.

Setup follows a practical sequence: add a domain, apply the displayed DNS instructions, create forwarding rules, then test receipt. SMTP Zen also provides delivery logs, giving users a way to review message delivery rather than relying only on the destination inbox.

Forwarding is inbound-only. To send as a custom-domain address, you need a hosted mailbox; the hosting plans state that SPF, DKIM, and DMARC are enforced, and the service describes its connections as TLS-encrypted. SMTP, IMAP, and POP settings are documented, with setup guides for iOS and Android mail apps. Developers can use SMTP examples for Node.js, Python, PHP, Ruby, and Go, connecting on port 465 with implicit TLS or port 587 with STARTTLS.

Hosted mailboxes include Crossbox webmail, with unified inboxes, search, keyboard shortcuts, calendar, and contacts. Most accounts can send about 400 outbound messages per mailbox per hour, including aliases. That is a meaningful ceiling for ordinary business correspondence, not a fit for high-volume campaigns. SMTP Zen prohibits cold outreach and mass-marketing blasts, as well as sending to scraped, rented, or purchased lists.

Pricing

SMTP Zen is paid, with no free plan. Most plans include a 2-day free trial, though custom plans may be excluded. The listed monthly plans are:

• Roll your own — $1.20 a month: One mailbox, one email forwarder/alias, 2GB base disk quota, unlimited domains and bandwidth, and full customization. It is the lowest-cost route to a mailbox, but one alias makes it restrictive for users who need several distinct addresses.
• Starter SMTP — $2.99 a month: Five mailboxes, 10 forwarders/aliases, 5GB base disk quota, unlimited domains and bandwidth. This is a better fit for a small team or a user managing several addresses.
• Freelancer SMTP — $5.99 a month: 10 mailboxes, 10 forwarders/aliases, 10GB base disk quota, unlimited domains and bandwidth. The additional mailbox capacity suits freelancers managing multiple client accounts, though the alias allowance stays at 10.
• Pro SMTP — $11.99 a month: 20 mailboxes, 10 forwarders/aliases, 20GB base disk quota, unlimited domains and bandwidth. It adds mailbox capacity rather than more aliases, so it is the stronger fit for a larger group of mailbox users, not for someone chiefly seeking more forwarding addresses.

All listed plans are monthly prices. The difference between tiers is chiefly mailbox count and disk quota; unlimited domains and bandwidth are common across them. The roughly 400-outbound-emails-per-mailbox hourly limit and restrictions on marketing use apply to plan selection as well as day-to-day sending. Custom pricing is an option for needs outside the listed tiers, but custom plans may not include the trial.

Platforms

SMTP Zen lists Android, iOS, and web support. Its client setup documentation and standard SMTP, IMAP, and POP settings make it relevant to people who want to use mobile mail apps or connect software through SMTP.

Who it's for

Choose SMTP Zen when you want custom-domain forwarding into existing inboxes and may also need hosted mailboxes for authenticated sending. Developers get language-specific SMTP examples; freelancers and small teams get multiple domains and mailbox tiers; domain investors can route addresses without maintaining a separate mailbox for each one.

Look elsewhere if you need a free tier, bulk marketing, or forwarding alone with no paid plan. If sending as the domain matters, budget for a hosted mailbox rather than treating forwarding as a complete email account.

Pros and cons

• Pro: Catch-all and named forwarding across multiple domains avoid the need to create a mailbox for every address.
• Pro: Hosted mailboxes combine documented authentication, standard client protocols, and Crossbox webmail, giving users an outbound option as well as inbound routing.
• Pro: SMTP examples cover five programming languages and two TLS connection modes, making the service relevant to application email integrations.
• Con: Forwarding itself provides neither an inbox nor authenticated outbound SMTP, so users who need to reply as their domain must pay for a mailbox plan.
• Con: The 2-day trial is brief, and custom plans may not include it.
• Con: The listed mailbox plans cap aliases at 10 except for Roll your own, which includes one; higher tiers add mailboxes and disk rather than more aliases.
• Con: The sending limit and prohibited-list rules rule out cold outreach and mass-mailing use cases.

Alternatives

For a broader comparison of forwarding options, see Email Forwarding Services.

• Forward Email is the alternative to consider if a free plan, open-source software, or a wider range of platforms—including self-hosted and desktop options—is important.
• Cloudflare Stream is a video-storage service, not a direct email-forwarding substitute.
• Gomailify is worth considering if you want a paid service for linking Gmail accounts, with a stated annual price for up to two accounts.
• Delivery Machine offers a free API plan with three domains, 10 addresses per domain, and 500 emails per month, making it a stronger starting point if those caps meet your needs.
• DNSExit Email Forwarding has a free option for domains registered through DNSExit and an annual paid tier, which may suit users already registering domains there.
• EForw has a free plan with one domain, unlimited catch-all aliases, and SPF, DKIM, and DMARC pass, making it a relevant choice if free catch-all forwarding is the priority.
• Forward offers a free tier with one domain, 25 aliases, 500 forwards per day, seven days of logs, and one team seat; consider it if those published caps are sufficient and you want to start without a paid plan.
• Haltman mail-forwarding-core is a free forwarding-only option with unlimited forwarding rules, users, addresses, domains, and emails, suited to users who do not need hosted mailboxes.

Verdict

SMTP Zen is a good choice for developers and small professional operators who want custom-domain forwarding plus the option to add hosted mailboxes and send through standard email clients or SMTP. Its broad domain allowance and documented connections are practical strengths. Choose another service if you need free forwarding, more aliases than the listed plans allow, or a platform built for bulk marketing.