Static IP Mail Server Configuration | Anti-Spam Server Configuration Guide

A. Why do mail servers need static IPs?

Many organizations send emails with dynamic IPs and often encounterMail rejectedmaybein the trashThe problem. This is because dynamic IP changes can lead to a drop in the trust score of the email service provider. For example, if you send emails with US IP yesterday and suddenly change to German IP today, the recipient system will directly determine it as abnormal behavior.

Static IPs are like fixed door numbers. Long-term stable IP addresses allow email service providers to build a trusting relationship. With ipipgo'sStatic Residential IPNot only do they ensure that the outgoing address is fixed, but they also avoid the risk of being blacklisted - their IP library is rigorously screened to ensure that each IP has a real record of home network usage.

Two, three steps to build anti-spam server

Step 1: Server environment isolation
Prepare a separate server dedicated to mail sending and receiving, do not share IP with other services. ipipgo's static IP service is recommended.Geographic location that matches where the business is located. For example, if the main customer is in the United States, you should choose the U.S. family residential IP, so that the geographic location of the outgoing mail and the time zone of the recipient match perfectly.

Step 2: Reverse Resolution Configuration
Add PTR records in the DNS management background to resolve the IP address to your email domain name. This step is equivalent to the post office to do "business license", ipipgo support self-submission of PTR resolution applications, 15 minutes to take effect, more than 3 times faster than other service providers.

Step 3: Sending frequency control
The most common mistake that newbies make is to send a large number of mass mailings in a short period of time. It is recommended to send no more than 200 packets per hour in the initial stage, and after 3 days of continuous and stable operation, increase the daily sending volume by 10%. With ipipgo'sIP Rotation FunctionThe send task can be automatically assigned between different static IPs.

Third, anti-banning practical skills

IP warm-up program:
1. First 3 days: internal test mailings only
2. Days 4-7: 50 real e-mails per day
3. Starting on day 8: Step-up in 20% increments

Content Filtering Circumvention:
To avoid high-frequency sensitive words in the body of the text, here's a practical tip: Make the marketing content a PNG image attachment, while writing a text version of the content at the bottom of the image in size 6 font. It doesn't interfere with reading, but also bypasses keyword scanning.

IV. Solutions to common problems

Q: Why do SPF records still go into the trash when configured?
A: Check whether the IP belongs to the same place as the domain name registration. For example, if a domain name is registered in the United States but sends mail from a Brazilian IP, in this case use ipipgo'sIP Attribution Customization ServiceIt'll work out, they support IP selection down to the exact city level.

Q: How to manage IP resources for multiple email accounts?
A: It is recommended to assign dedicated IPs according to the type of business. sales department will use group A IPs and customer service department will use group B IPs. ipipgo's user backend can create multiple IP groups, and each group can independently set the traffic limit and switching rules.

Q: How to recover quickly when I encounter IP blocking?
A: Immediately stop all sending operations of this IP, and send 5 test emails first after 72 hours. ipipgo's IP health monitoring function will real-time prompt each IP'scredit rating, IPs with less than 70 points are recommended to be suspended.

V. Long-term maintenance strategy

Do it once a monthIP Reputation Check, use free tools like mxtoolbox to scan for blacklist status. If you find an IP is blacklisted by more than 2 anti-spam organizations, it is recommended to submit a replacement request in the ipipgo backend, they offerResponse within 1 hourof quick replacement services.

Open 3 days in advance in case of holidays or promotionsIP warm-up mode. By gradually increasing the sending volume, the monitoring system of email service providers can adapt to the traffic changes. Together with ipipgo's traffic alert function, the system will automatically enable the backup IP pool when the sending volume reaches the set threshold.

Lastly, don't believe in the so-called "black technology", stable email delivery rate = compliant content + quality IP + operation and maintenance. Choose a company like ipipgo that hasReal Residential IP ResourcesIt is the service provider that guarantees the long-term stable operation of the mail server.