Hard Bounces: Emails sent to malformed addresses will almost always result in hard bounces immediately damaging your sen

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Wasted Sending: You're sending to addresses that can never be delivered, wasting your ESP credits and potentially your time.
Identification: While ESPs catch basic syntax errors, more subtle typos (like gamil.com) require dedicated email validation services that check against DNS records and email server responses. Manually reviewing segments of your list can also reveal obvious errors.
C. Presence of Role-Based Email Addresses
Role-based email addresses are generic addresses used by a department or function rather than a single individual. While not inherently "dirty," a high percentage of them can be a red flag.

Why They're Problematic:
Often Shared: These addresses are typically laos email list monitored by multiple people, making personalization difficult and reducing the likelihood of a direct, individual connection.
Low Engagement: Recipients of role-based emails may be less likely to engage personally with marketing content as it's not directed at them specifically.
Higher Chance of Being Spam Traps: Some older, abandoned role-based addresses can be converted into spam traps by ISPs.
Indicative of Poor Acquisition: A high proportion suggests that your list might have been scraped, acquired through less-than-ideal B2B lead generation methods (where general company emails are gathered), or wasn't gathered from individuals who explicitly opted in.
Caution: For some B2B marketing, these addresses might be legitimate points of contact. However, if your business model targets individual consumers or specific roles within a company, a high percentage of info@ or support@ addresses in your list is a sign that your acquisition strategy isn't targeting the right individuals.
D. Duplicate Email Addresses
Duplicate entries mean the same email address appears multiple times on your list.