To avoid this, we at SalesAR used the following measures:

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Verification tools. We checked each address through specialized services, such as Hunter Email Verifier. This allowed us to detect invalid e-mails that are no longer in use, avoid sending to generic addresses (info@, support@), and identify addresses with a high bounce rate.
Regular review. To keep the database up-to-date, we re-checked the contacts every two months, removing outdated or invalid entries, before doing dynamic mass email campaigns.
Domain reputation protection . Thanks to systematic verification, we have maintained a consistently high level of email deliverability, minimizing the risk of being blacklisted.
Tools for finding contacts to send emails
To quickly and accurately search for contacts, our marketers used several uk email list effective methods and tools:

Using a company domain: Using Hunter Email Finder, we found addresses based on the company email domain and the prospect's name. This works especially well for medium to large organizations.
Bulk search. For large campaigns, we used Bulk Email Finder, which allows you to simultaneously check the existence of emails, hundreds of contacts, saving time by automating the process.
Google Sheets integration. Integration with Google Sheets made it easy to manage large contact lists and provide convenient access to updated data. It also made it easy to share results with your team or clients.
Practical tips for improving contact search: