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Questions most frequently asked:
What is email automation?
Email automation is the practice of sending pre-built emails to your contacts automatically — triggered by a date, a contact...
Read moreIs Port 587 Always Encrypted?
Short answer: Port 587 is not encrypted by default — but it is the standard port for encrypted SMTP submission...
Read moreHow to Check Your SMTP Connection
If your emails aren't going out, the first thing to test is the SMTP connection itself. A 30-second check tells...
Read moreWhat is My SMTP Username and Password?
Your SMTP username and password are the credentials your email client or app uses to authenticate with the SMTP server...
Read moreWhere Do I Find My SMTP Server in Mailpro?
Your Mailpro SMTP server details are everything you need to send transactional or marketing email from your app, CRM, CMS...
Read moreWhen Is the Best Time to Send My Newsletter?
The honest answer: the best time depends on your audience. Industry benchmarks help you start, but only A/B testing and...
Read moreHow to Create Your Captcha with Google?
Google reCAPTCHA blocks bots and spammers from polluting your subscription forms in just a few clicks. Here's how to add...
Read moreHow to Integrate Mailpro SMTP with an AI / GPT Operator
Connecting your Mailpro SMTP relay to an AI agent — like ChatGPT Operator, Claude, n8n or your own Python/Node script...
Read moreHow to Fix "DMARC Policy Not Enabled"
If a deliverability tool tells you "DMARC policy not enabled", your DMARC record exists but is set to p=none. That...
Read moreCan I Rent a Fixed IP, and What Are the Terms?
Yes — you can rent a fixed (dedicated) IP for sending campaigns from your Mailpro account. The fixed IP is...
Read moreCan I Add Branching Logic to My Surveys?
Yes — Mailpro surveys support branching logic, so each respondent only sees the questions that apply to them. Based on...
Read moreHow Does Mailpro Ensure the Security of Survey Data?
Mailpro protects survey data on three levels: in transit (SSL/TLS), at rest (encrypted Swiss-hosted databases) and at access (passwords, CAPTCHA,...
Read moreDoes the Survey Tool Provide Analytics and Reporting?
Yes — Mailpro’s survey tool ships with built-in analytics that update in real time. You see how many people opened...
Read moreCan I Customize the Look and Feel of My Surveys?
Yes — surveys built with Mailpro can be styled to match your brand from the cover page to the thank-you...
Read moreWhat Is DNS Error 5.7.26 and How to Fix It?
DNS error 5.7.26 is the bounce code Gmail returns when an incoming message fails its sender authentication checks. The address...
Read moreHow to Fix Error 5.1.1 (User Unknown)
Code 5.1.1 « User unknown » (sometimes returned with 550 5.1.1) means the receiving server cannot find the user part of the...
Read moreHow to Fix Error 5.7.1 (Relay Access Denied)
Code 5.7.1 « Relay access denied » means the SMTP server you connected to refuses to forward your message to...
Read moreHow to Fix Error 530 (Authentication Required)
SMTP error 530 means: I won’t accept your message until you log in. The server is asking for authentication and...
Read moreHow to Fix Error 552 (Storage Limit Exceeded)
SMTP error 552 means the destination has refused the message because it exceeded a storage or size limit. Two distinct...
Read moreHow to Fix Error 451 (Local Policy Violation or Greylisting)
SMTP error 451 is a soft bounce: the receiving server is asking to try again later. The two most common...
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