While these are not as bad as outdated or fake addresses, having doubles will result in one recipient receiving multiple emails from you in each campaign. This can be seen as intrusive, and you risk being flagged as spam. To remove indian phone number list duplicates manually, review the list and check if you spot any repeated emails. Using a simple CTRL+F (or CMD+F) can be of help here. Cost: free Effort: moderate to significant, depending on the size of your list 3 Send re-engagement campaigns In these campaigns, you target a segment of your lists that are not unsubscribed and ask these recipients if they still want to receive emails from you. Typically, that is the entire email content: asking if they still want to be on the list.

After the replies, you can manually remove each recipient that does not click on a link or reply to an email. Cost: the cost of your email marketing tool Effort: low since you can find information on unengaged subscribers fairly easily 4 Ask for contact updates Send out a campaign manual and ask your subscribers to update their contact data. This can be a new email (since they're not using their old one), a change in their job title, the company they're working for, or something else. Cost: the cost of your email marketing tool