Browse the Learning Center
ESP setup
SPF and DKIM guides for HubSpot, Brevo, Chargebee, and more.
28 guides
Read in order
All ESP setup guides
Gmail SMTP settings: ports, auth, and alignmentCompare Google's three Gmail and Workspace SMTP methods, pick the right authentication model for your device, and verify SPF, DKIM, DMARC, and delivery.
Office 365 SMTP settings and authenticationUse current Office 365 SMTP settings, choose OAuth and mailbox policy safely, then validate SPF, DKIM, DMARC, safe sending limits, and delivery.
Brevo email warmupBrevo email warmup is not documented as a native Brevo feature in the available help material. Check domain authentication before changing sending.
Email authentication in Mailchimp: what to verify firstEmail authentication Mailchimp requires current Mailchimp setup documentation and DNS evidence. Learn what to verify before changing a sending domain.
How to improve HubSpot email deliverabilityHubSpot improve email deliverability by checking sender authentication, message results, and list signals before changing campaign practices.
Mailchimp email warmup: what is documentedMailchimp email warmup is not a documented Mailchimp workflow in available official evidence. Check authentication and sending evidence instead.
SendGrid email warmup: what you can verify firstSendGrid email warmup needs current provider guidance. Verify your sending path and email authentication before adopting a ramp schedule for your account.
Zoho email warmup: what it is and what it cannot proveZoho email warmup is an optional third-party workflow, not a proven Zoho requirement. Check domain authentication before connecting a warm-up service.
Mailchimp one-click unsubscribe: headers, body links, and validationMailchimp's body unsubscribe link takes two clicks, which does not disable header-based one-click. Verify the header in a real campaign, not a preview.
Mailgun email warmup: when to warm a dedicated IPMailgun senders on shared IPs do not need new-IP warmup. Learn when a new dedicated IP needs a controlled ramp and what to verify.
One-click unsubscribe in Salesforce Marketing CloudUnderstand one-click unsubscribe on Salesforce Marketing Cloud commercial sends and validate the delivered-message result.
SendGrid one-click unsubscribe: headers, subscription tracking, and validationConfigure or verify SendGrid one-click unsubscribe with Subscription Tracking or custom headers, then inspect a delivered message.
Mailchimp SPF record: when do you need one?Mailchimp DMARC alignment can pass through aligned DKIM without Mailchimp in SPF. Inspect headers, verify DNS, and validate the sending path.
Why Mailchimp email goes to spam after marked deliveredWhy Mailchimp email goes to spam after marked delivered: separate accepted delivery from mailbox placement, inspect headers, and retest safely.
Can Amazon SES and Palisade be used together for bulk sender compliance?Amazon SES and Palisade for bulk-sender compliance: authenticate SES mail, validate real messages, then use DMARC evidence for safe remediation.
How to configure SPF and DKIM for ChargebeeConfigure SPF and DKIM for Chargebee by authenticating the custom SMTP provider, connecting it in Chargebee, and validating a real notification.
How do I set up SPF and DKIM for SendGrid?SendGrid SPF and DKIM setup: authenticate a domain, publish account-generated DNS records, verify SendGrid, inspect headers, and validate DMARC.
How do I set up SPF and DKIM for Amazon SES?Set up SPF and DKIM for Amazon SES by publishing identity-specific Easy DKIM records, configuring custom MAIL FROM, and validating real mail.
HubSpot SPF and DKIM setup: connect and verifyHubSpot SPF and DKIM setup: connect your sending domain, publish account-generated DNS records, verify HubSpot, and validate a real message.
Why Brevo does not provide SPF alignment by defaultBrevo SPF alignment is not default because standard domain setup uses Brevo's return path. Verify aligned DKIM, headers, and DMARC results now.
How to set up DKIM keys in SalesforceDKIM keys in Salesforce: create primary and alternate CNAME records, activate signing, and validate DNS, headers, and DMARC reporting for Salesforce email.
How to set up SPF and DKIM for Brevo (formerly Sendinblue)How to set up SPF and DKIM for Brevo: authenticate the sending domain, publish Brevo's account-generated DNS records, then validate a real message.
How do I set up SPF and DKIM for Customer.io?Customer.io SPF and DKIM setup: add a sending domain, publish its account-generated DNS records, verify delivery, and check DMARC alignment.
How do I set up SPF and DKIM for Klaviyo?How to set up SPF and DKIM for Klaviyo: configure a branded sending domain, publish Klaviyo's DNS records, verify it, and validate DMARC alignment.
How do I set up SPF and DKIM for Mailchimp?Mailchimp SPF and DKIM setup: authenticate a sending domain with Entri or two CNAME records, preserve SPF, add DMARC, and validate a campaign.
How do I set up SPF and DKIM for Zoho Campaigns?Set up SPF and DKIM for Zoho Campaigns by verifying the sender, publishing Zoho's DNS values, testing a delivered campaign, and checking DMARC.
Mailgun SPF and DKIM Setup: Exact DNS RecordsSet up Mailgun SPF and DKIM with the exact DNS records. Learn when to use DKIM CNAMEs, why send-only domains skip Mailgun MX, and how to verify alignment.
How do I set up SPF and DKIM for Postmark?Postmark authenticates via its own Return-Path, so the include is unnecessary. Real setup: one DKIM TXT record plus a Return-Path CNAME for alignment.