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Questions most frequently asked:
What Is the Countdown Timer and Why Does It Stop After 40 Seconds?
The countdown timer is an animated visual that shows the time remaining until a deadline (a sale ending, a webinar...
Read moreWhat Is the Difference Between Single Opt-in and Double Opt-in Subscription?
The difference between single opt-in and double opt-in comes down to one extra click: the confirmation. With single opt-in, the...
Read moreHow Does the Automatic Credit Recharge System for Emails Work?
Automatic recharge (auto top-up) keeps your account funded so high-volume sending never stops for lack of credits. It is mainly...
Read moreHow Does the Mailpro Reward Program Work?
The Mailpro reward program turns your loyalty and word-of-mouth into free email credits. Every time you renew on time, recommend...
Read moreHow Does Automatic Subscription Renewal Work?
Mailpro subscriptions automatically renew on the cycle you chose at signup — monthly, quarterly, or annual — provided your account...
Read moreHow Do I Send Emails with an SMTP Server?
Sending email through Mailpro’s SMTP server takes about ten minutes from start to first message. The exact steps depend on...
Read moreHow to Change the Default Language of an Automatic Link?
When Mailpro automatically inserts a link in your email — the unsubscribe link, the “view in browser” link, the “forward...
Read moreHow Is CC or BCC Copy Sending Handled by SMTP?
CC (Carbon Copy) and BCC (Blind Carbon Copy) work over Mailpro’s SMTP relay exactly the same way they work in...
Read moreHow to Manage Unsubscribe Link for SMTP Messages?
Even when you send through SMTP from your CRM or your own application, every commercial message in 2026 must include...
Read moreHow Are Statistics Collected from an SMTP Sending?
An SMTP send is fast and silent: your application hands the message off, the relay delivers it, and unless something...
Read moreWhere Do I Find the SMTP Authentication Credentials in Mailpro?
To send messages through Mailpro’s SMTP relay you need four pieces of information: server host, port, username and password. They...
Read moreWhat Type of SMTP Server to Choose?
Choosing the right SMTP server is one of the most consequential technical decisions for any business that sends email at...
Read moreWhat Is the Maximum Weight of a Message Sent Through SMTP?
Mailpro’s SMTP relay accepts messages up to 20 MB total, including the email body, headers and all attachments after Base64 encoding...
Read moreWhat’s the difference between SMTP and API?
Both SMTP and a transactional Email API send messages from your application to your customers, but they take different paths...
Read moreWhat Is an SMTP Server? How SMTP Relay Works and Why You Need It
An SMTP server (Simple Mail Transfer Protocol) is the dedicated server that handles outgoing email. When your application, CRM or...
Read moreWhy Does My Email Look Strange on Outlook?
Outlook is the email client most likely to make your beautiful campaign look broken — clipped images, lost background colors,...
Read moreWhat Is IP Reputation and Why Does It Matter?
IP reputation is the trust score that mailbox providers (Gmail, Yahoo, Outlook, Apple Mail) assign to the IP address that...
Read moreFile Sizes and Extensions Supported by Mailpro Builder
The Mailpro Builder accepts a wide range of file types for images, attachments and downloadable resources. Each type has a...
Read moreMSISDN: Definition and Format (CC+NDC+SN)
MSISDN stands for Mobile Station International Subscriber Directory Number. It is the worldwide format your SMS gateway uses to identify...
Read moreHow to Schedule an SMS Campaign with Mailpro
Scheduling an SMS campaign in Mailpro lets you prepare the message in advance and have it delivered at the exact...
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