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The shortage of sending email with Mail Express Series
The softwares in Mail Express Series, are useful email delivery servers for most users. With the Internal Delivery Engine, you can send emails to the recipients directly, and faster, more secure than others. But there are also shortages when you send email with the Internal Delivery Engine:
Can not bypass the port 25 block issue
When the Internal Delivery Engine of Mail Express Series softwares send an email to a recipients, it will create a direct connect to the Mail Exchange (MX) server when the recipients' mailbox on. Because all MX servers listen at port 25, so the Internal Delivery Engine must create this connection at port 25. As you know, many ISPs block the port 25 for anti-spam issue (please see " About Port 25 Block Issue"), so if your ISP blocks the port 25, the Internal Delivery Engine can not create the connection to the MX server of recipients at port 25, and you can not send emails out. The Internal Delivery Engine can not bypass this issue, except you add your ISP's SMTP server into the Delivery Engine List of Mail Express Series, but for many users, there are too many limitations in the ISP's SMTP server, it is not a good solution for them.
The mail servers of recipients refuse the emails from your computer
For many email service providers, their MX server will refuse your email from the Internal Delivery Engine of your computer or ISP's SMTP server. There are three reasons can cause this issue:
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The IP address of your computer is a dynamic IP address
When you connect to internet with the service of your ISP, such as dial-up, DSL, etc., you will get an IP address from your ISP. This IP address is different every time you connect to internet, it's a dynamic IP address. When you send email with the Internal Delivery Engine of Mail Express Series software running in your system, it will create a connection directly to the MX server of the recipients, and the MX server will get the IP address of your computer and check if it is a dynamic IP address or not. If yes, the MX server will do something for your email, for example, in America Online (AOL), it will refuse your email, and in Yahoo, it will place your email into the spam folder.
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No rDNS record for your IP address
Reverse DNS (rDNS) is a method of resolving an IP address into a domain name, just as the domain name system (DNS) resolves domain names into associated IP addresses. Many spam filters of email service providers check if your IP address matchs your domain name with rDNS. But for many personal computer, it is impossible to add rDNS record for their dynamic IP address, so many email servers will refuse the connection from your Mail Express in your computer, such as AOL.
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Your IP address is in the blacklist
If someone who is use the same ISP as yours sends spams to many email servers, many email service providers will add the whole IP section of your ISP into the blacklist of their email servers. All emails from your computer or your ISP's SMTP server will be refused by those email servers.
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Your Mail Express runs in your own computer, so it can not bypass above two issues with it's Internal Delivery Engine, even you add your ISP's SMTP server into the Delivery Engine List of your Mail Express, it also can not send email to some email servers.
As a solution, we provide a service named " Across-Mail Service" to our customers, it can solve all above issues. It provides multi-SMTP port for you to bypass the port 25 block issue, with non-cost-free service and internal spam filter to against spammers. You can also check the statistics of your email delivery by login to the Control Panel of Across-Mail Service, and manage the emails you have sent.
Althrough Across-Mail Service can work with any email client softwares in all platforms, but if you are a Windows user, we suggest you use Across-Mail Service with the Mail Express Series softwares. In Mail Express Series softwares, we add many funtions in it, just for transfer data to Across-Mail Service faster, more safe and stable. Such as the AMSMTP (Across-Mail Service Mail Transfer Protocol), it is a mail transfer protocol we added in Across-Mail Service, and provide many features in email transfer, such as email compress, email encrypt, transfer from the break point (as same as many download programs), etc. AMSMTP is only supported in Mail Express Series, so you will get higher performance in sending email from Mail Express Series to Across-Mail Service.
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