Deliverability & Spam
What “Delivered” Means in SMTP—and What It Does Not Mean
250 is acceptance. Search the store after. 4xx retries. 5xx stops. Sent folder is not inbound.
smtp delivered meaning
Read the guideMailerZ Blog
Domain email guides you can operate.
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Agency & Multi-domain
Multi-Domain SMTP Sending Without Running Your Own Mail Cluster
You do not need Postfix on a VPS. You need approved Froms and a lookup-safe SPF per zone.
multi domain smtp sending
Read the guideSecurity & Abuse
Is Email Forwarding Secure? Threat Model for Custom Domains
The hop is a new trustee. Verify the domain. HOLD unknowns. Rotate secrets. Do not rewrite From.
email forwarding security
Read the guideCustom Domain + Gmail
How to Create support@, sales@ and billing@ Without Extra Gmail Accounts
Role addresses are routes, not seats. Map three names. Cut leftover MX. Probe from another mailbox.
domain aliases without extra gmail accounts
Read the guideDNS & MX
Email DNS Cutover Runbook for Small Businesses
Aliases before the window. Exclusive MX during it. Third-mailbox proof. Rollback is the old screenshot, not dual MX.
email dns cutover runbook
Read the guideCost & Workspace Alternatives
How to Cut Email Costs When Most Addresses Are Only Aliases
Roles are map rows. People are seats. Cancel only after a third-mailbox probe.
reduce business email cost aliases
Read the guideCost & Workspace Alternatives
When Paying for a Full Email Suite Is Actually Worth It
Buy the suite for the suite. Buy the hop for printed strings. Both MX live is not a compromise.
when to use google workspace
Read the guideDNS & Email Records
Leftover MX Records: The Hidden Reason Some Email Goes to the Old Provider
Two MX owners is a coin flip. Publish one set. Query two resolvers. Do not keep the old host as backup.
leftover mx records
Read the guideDelivery Recovery & Observability
Why a Forwarding Service Is Not an Email Archive
Name the store you will search next year. MailerZ keeps hop evidence for 14 or 90 days. Legal hold stays in Gmail, Outlook, or a suite.
email forwarding vs archive
Read the guideBuyer Guides & Decision
Best Email Alias Service for Business Role Addresses
Print the role. Keep the inbox you already use. Map named aliases, hold unknown, prove inbound, and add send-as only if the role must reply.
best email alias service business
Read the guideSPF DKIM DMARC SRS ARC
DMARC p=none vs quarantine vs reject for Small Domains
p=none watches. Quarantine treats fails as suspect. Reject refuses them. Inventory senders, publish SPF and DKIM, and read rua before you tighten policy.
dmarc none quarantine reject
Read the guidePrivacy & Masked Email
Anonymous Email Forwarding: Real Privacy vs Marketing Claims
Durable aliases yes. Anonymity no. The registrable domain still names you.
anonymous email forwarding
Read the guideDeliverability & Spam
Why Forwarded Email Goes to Spam: A Layer-by-Layer Diagnosis
Walk MX, identity, hop, then filters. A pretty DNS screenshot is not placement. MailerZ has no inbox SLA.
why forwarded email goes to spam
Read the guideCustom Domain + Gmail
Gmail Custom Domain Email: The Cheapest Reliable Setup for 2026
Reliable cheap is one MX set and an external probe. Free receives. Paid send-as when replies must show the domain. Workspace if you need the suite.
gmail custom domain email
Read the guideDeveloper & Website SMTP
When Developers Should Use SMTP vs an Email API
Receipts can be SMTP. Lists should not. Exclusive MX still owns inbound replies.
smtp vs email api
Read the guideDNS & MX
How to Check MX Records Before Switching Email Providers
Look up MX in public. Save the old set. Publish one new set. Delete leftovers. Prove inbound. Dual MX is not a backup.
check mx records
Read the guideAgency & Multi-domain
How to Consolidate Client Domain Email Into Existing Inboxes
Maps not mailbox farms. Serial cuts. Existing Gmail tabs.
client domain email consolidation
Read the guideSMTP Send-as
How to Send Website Contact Form Email Through Authenticated SMTP
Forms need an approved From and a secret you can revoke. PHP mail() is not a plan.
website contact form smtp
Read the guideCompetitor Comparisons
MailerZ vs Forward Email: Managed Routing Compared
Compare leftover-MX discipline, unknown HOLD, hop store, send-as caps, and honest From. Not an inbox SLA on either side.
mailerz vs forward email
Read the guideDeveloper & Website SMTP
How to Send Low-Volume App Notifications From Your Own Domain
One event, one message. Count caps. Do not warm up a user dump.
app notification smtp custom domain
Read the guideAgency & Multi-domain
Email Routing Capacity Planning: Domains, Aliases and Send Volume
Count first. Quote the card. Agency does not merge leftover MX.
email routing capacity planning
Read the guideEmail Forwarding Fundamentals
Email Forwarding Service: What to Look for Before You Buy
Ask MX, leftovers, hold, store, 550, send-as. Skip inbox-rate badges.
email forwarding service
Read the guidePrivacy & Masked Email
How to Retire a Leaked Alias Without Losing Important Accounts
retire leaked email alias: one MX set, leftover hosts gone, Gmail or Outlook as the store.
retire leaked email alias
Read the guideCatch-all & Routing
Catch-All Email: Convenience vs Spam Risk
Convenience is leftover FORWARD. Spam is harvested names in Gmail. Hold unknowns. Print the aliases you actually use.
catch all email spam risk
Read the guideMigrations
How to Validate Every Alias After an Email Migration
Diff the export. Probe every critical name from another mailbox. History plus inbox is the pass. Catch-all is not a validator.
validate aliases after migration
Read the guide
