There are many providers that offer customized email lists of accountants, but the quality and accuracy of the lists can vary. Some factors to consider when looking for a reputable provider include:

Data accuracy: Make sure the provider guarantees a high level of accuracy for their email lists, and that they regularly update and verify their data.
Customization options: see if the provider offers the option to customize your list based on certain criteria such as location, industry, and more.
Legality: Make sure the provider follows all laws and regulations related to data privacy and marketing.
Some well-known companies that provide customized Accountant Email List include:
InfoGlobalData
It's important to do your research and compare different providers to find the one that best meets your needs. Keep in mind that buying or using email lists for unsolicited marketing or spamming is against the law in many countries and can cause serious damage to your business reputation. It's best to use legal and ethical ways to get the email lists like through sign-ups or opt-ins.

It's also important to note that emailing to individuals without their consent is illegal and unethical, and can cause serious damage to your business reputation. It's best to use legal and ethical ways to get the email lists like through sign-ups or opt-ins.