There are a few aspects affecting your deliverability, from the obvious ones like the quality of your emailing list to more complex ones, such as your domain reputation.
In a nutshell, domain reputation means the level of trustworthiness of your IP or domain address. This is one of the parameters an email service provider will assess when deciding whether to allow your emails into the recipient’s inbox.
A complex parameter, reputation is pretty hard to estimate and keep track of without specific tools. Some of the popular tools that can help you check email domains for spam are MxToolbox, GlockApps, Mail-tester.com, etc.
Domain spamming is relatively easy to spot and flag for the advanced email service provider safety mechanisms. Any activity (or lack thereof, e.g.