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function normalizeGmailAddress(email) {
const [localPart, domain] = email.toLowerCase().split('@');
// Check if it's a Gmail address
const gmailDomains = ['gmail.com', 'googlemail.com'];
if (!gmailDomains.includes(domain)) {
return email.toLowerCase(); // Return non-Gmail addresses as-is
}
// Remove dots from local part
let normalized = localPart.replace(/\./g, '');
// Remove plus tag and everything after
normalized = normalized.split('+')[0];
return `${normalized}@gmail.com`;
}
// Examples:
normalizeGmailAddress('john.smith@gmail.com') // â johnsmith@gmail.com
normalizeGmailAddress('johnsmith+news@gmail.com') // â johnsmith@gmail.com
normalizeGmailAddress('j.o.h.n.s.m.i.t.h@gmail.com') // â johnsmith@gmail.com
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async function addSubscriber(email) {
const normalized = normalizeGmailAddress(email);
// Check if normalized version already exists
const existing = await findSubscriberByNormalizedEmail(normalized);
if (existing) {
// Already subscribedâdon't create duplicate
return {
success: false,
message: 'This email (or a variant) is already subscribed',
existingEmail: existing.email
};
}
// New subscriberâproceed
return createSubscriber({
email: email,
normalizedEmail: normalized,
// ... other fields
});
}
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SELECT normalized_email, COUNT(*) as count, GROUP_CONCAT(email) as variants, MAX(last_engaged) as most_recent_engagement FROM subscribers WHERE email LIKE '%gmail.com' OR email LIKE '%googlemail.com' GROUP BY normalized_email HAVING COUNT(*) > 1 ORDER BY count DESC;
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async function mergeDuplicateGmailSubscribers() {
const duplicateGroups = await findDuplicatesByNormalizedEmail();
for (const group of duplicateGroups) {
// Sort by last engagement, most recent first
const sorted = group.subscribers.sort((a, b) =>
b.lastEngaged - a.lastEngaged
);
const primary = sorted[0]; // Keep the most recently engaged
const duplicates = sorted.slice(1);
// Merge engagement history
const mergedHistory = combineEngagementHistory(group.subscribers);
await updateSubscriber(primary.id, { engagementHistory: mergedHistory });
// Remove duplicates
for (const dup of duplicates) {
await deleteSubscriber(dup.id);
}
logMerge(primary, duplicates);
}
}
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const { verifyEmail } = require('emailverify');
async function verifyAndCategorize(email) {
const result = await verifyEmail(email);
return {
email,
isValid: result.status === 'valid',
isDeliverable: result.deliverable,
isDisposable: result.disposable,
isRoleBased: result.role,
isCatchAll: result.catchAll,
riskLevel: calculateRisk(result)
};
}
function calculateRisk(result) {
if (!result.deliverable) return 'high';
if (result.disposable) return 'high';
if (result.catchAll) return 'medium';
if (result.role) return 'medium';
return 'low';
}
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function getProviderEngagementReport(startDate, endDate) {
return {
gmail: {
subscribers: countSubscribers('gmail'),
avgOpenRate: calculateOpenRate('gmail', startDate, endDate),
avgClickRate: calculateClickRate('gmail', startDate, endDate),
unengaged30Days: countUnengaged('gmail', 30),
unengaged90Days: countUnengaged('gmail', 90),
trend: calculateTrend('gmail', startDate, endDate)
},
outlook: { /* ... */ },
yahoo: { /* ... */ },
other: { /* ... */ }
};
}
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// Available via npm
const normalizeEmail = require('normalize-email');
PythonïŒ
# Custom implementation recommended for Gmail-specific logic
def normalize_gmail(email):
local, domain = email.lower().split('@')
if domain in ['gmail.com', 'googlemail.com']:
local = local.replace('.', '').split('+')[0]
domain = 'gmail.com'
return f'{local}@{domain}'
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