Month: May 2022

  • How to Remove Mail Server From Spamhaus Blacklist?

    Spamhaus IP Address Blacklist Removal Process

    I have been using Digital Ocean for hosting couple of Websites from past couple of years. I am using a dedicated droplet as a mail server which hosts emails for all the domains. One day Gmail started bouncing emails from my mail server. I found out that Gmail is using Spamhaus blacklist to block emails…

  • Gmail Rejecting Emails: Spamhaus Blacklisted Digital Ocean Mail Server

    Gmail Refusing Mail Server Emails

    I felt a shock when I saw a pile of undelivered emails from Gmail in my Inbox. All the bounced emails had following details. I did not know what would be the root cause so I went through couple of checks. Possible Root Causes for Gmail Rejecting Emails I went through following possible root causes…

  • Excel Interop Slow? 3 Ways to Boost Performance.

    Excel Interop Slow? Boost Performance with These Tricks

    Are you reading Excel file using Interop library? Is the application performance sluggish? Well, Interop is slow but that does not mean that you cannot improve performance. Understanding the root cause and avoiding pitfalls will surely help you improve the performance. Making a minor tweaks in code, I was able to reduce the time of…