How DNS Works Anyone that has ever configured their own custom/vanity nameservers will know that the nameservers must be set at both the server and at the registrar. Very few people really understand why. Understanding why means that you need to first understand a bit about how DNS works. To revisit the process of configuring your own […]
An SOA Record is short for Start of Authority. What does that mean? The SOA Record specifies authoritative information about a DNS zone, including the primary name server, the email of the domain administrator, the domain serial number, and several timers relating to refreshing the zone. Here’s an SOA Record example: The example shows a dig result […]
Every time you a host website or point a domain to a specific IP address, you always need to wait for some time till the Domain name resolves to that IP address or any DNS entry for taking effect; that particular time is considered as DNS propagation time. In this specific article, you will learn […]
Mail servers utilizing SMTP have a pre-defined errors that correspond with an identifier that provides an explanation as to why the sending mailer received a bounceback. These bounceback messages/error codes are default in mail servers but every provider may be different in how/what they address those email error code are. Provided below is a composed […]
When attempting to resolve mail server errors/issues, being able to test the connection to a remote SMTP server is a critical step. Testing a remote SMTP / mail server connection should be done from both a local machine (computer) and the server experiencing the issue. If a connection can be made from both locations, the […]
Simple Mail Transfer Protocol i.e., SMTP is used for sending and receiving emails. Whenever an email is rejected by the third party server or by the parent email server, then SMTP produces a specific Error/Response, which can be used to troubleshoot/identify the cause of email delivery failure. We gathered most of the SMTP errors/responses users […]
Earlier, we have gone through the Email / SMTP Response and Error Numbers article, in which we have mentioned a list of SMTP errors/responses with their possible resolution. Going through the SMTP errors/responses, you might face a problem understanding the numeric SMTP Error (SMTP ERROR 451, SMTP ERROR 552, etc.). This article will provide you […]
SPF, DKIM, and DMARC records are intended to fight SPAM and email spoofing. These mechanisms don’t analyse content of the message in search of malicious code, spam-like content, or content that would be used in a phishing attempt. Other dedicated tools should be used to detect viruses & malicious scripts or to flag messages as spam-like or scam-like based on […]
If you already know how many emails are in the Exims queue and want to see certain short information regarding each email in the queue, you can print a list of the emails currently queued by performing this command: Check out this screen shot for an example: Reviewing an example from that output: Let’s break […]
25+ Reasons We Love Cloudflare Cloudflare can be an indispensable asset for your site and here are 25 awesome features that are enabled by default under their free plan: Brotli Standard level of Automatic Static Content Caching with instant cache purge Always Online (keeps the static portion of your site online when origin server is […]