A large percentage of email bounces stem from one common problem: typos. Two common types of typos are easy to fix.
1. Missing punctuation. Often, the problem is as simple as a period missing in “.com” or the @ sign missing before the ISP name.
2. Misspelled ISP. Sometimes there’s an obvious misspelling in the ISP name. For instance, Verizon may be misspelled as Verison.
It’s worthwhile scanning your bounces and correcting any caused by these problems. Some companies with larger volumes have spell check built right into their email signup process.
Another tip for minimizing typos: make your email signup box long enough to accommodate even the longest of email addresses. If the person signing up can see their whole address in one glance, it’s much easier for them to spot and correct any mistakes.