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TestingBCC and CC in SMTP Emails: API Fields, Headers, and Tests
Understand CC and BCC in SMTP email, how recipient fields behave in APIs, and how to test BCC visibility with MailSlurp inboxes.
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Find practical implementation guides for email and SMS APIs, automated testing, deliverability, inbound workflows, and account setup.
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BCC in Email: Meaning, Examples, and Uses
BCC means blind carbon copy. Learn who can see BCC recipients, what Reply All does, how to add BCC in Gmail and Outlook, and how to test it.
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Best SMTP Port: 25 vs 465 vs 587 vs 2525
Compare SMTP ports 25, 465, 587, and 2525. Learn which SMTP port to use for app sending, relay, STARTTLS, implicit TLS, and MailSlurp validation.
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Configuring DNS records for SMTP is important for email delivery.
How to configure DNS records for SMTP mail servers or MailSlurp custom domains.
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AccountCreate a MailSlurp subscription using a quote today!
How to procure an account using a quote and invoice
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DeliverabilityCreating custom domains
How to use MailSlurp custom domains for inboxes, routing, and sender-controlled workflows. Verify DNS, create addresses on your own domain, and connect branded email to apps, tests, and operations.
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Creating inboxes
How to create inboxes with custom domains or pre-assigned email addresses.
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Email & APIsDeno Email APIs for Sending Emails
Learn to Send and Receive Emails in Deno with MailSlurp: A Tutorial for the JavaScript Runtime created by NodeJS's inventor Ryan Dahl.
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DeliverabilityDKIM records explained: DNS record example, selectors, and setup
Learn what DKIM records are, see a DKIM DNS record example, understand selectors, and fix signature failures in production email systems.
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SMS & OTPEmail and SMS deliverability load testing with MailSlurp
Run email deliverability testing and SMS delivery testing at scale. Track missing messages across inboxes and phone numbers, monitor runtime, and export results for analysis.
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Email auto-forwarding rules
Configure Email Forwarding for Inbound Messages: MailSlurp allows you to create rules and forward incoming emails to specified addresses.
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Email in code examples
See MailSlurp in action with example code for inbox APIs, email and SMS testing, inbound webhooks, and structured extraction workflows.
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