email-normalize
Return a normalized email-address stripping ISP specific behaviors
Decision gist · record as of 2026-08-14
Yes. The package is actively maintained, has no known vulnerabilities, uses a permissive license, and solves a real problem in email handling with low install friction. It's well-suited for applications that need reliable email normalization across multiple providers, especially those requiring async support or batch processing.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.11 or later.
- Runtime dependencies aiodns and tldextract must be installed (handled automatically by pip).
- Low friction installation with only two runtime dependencies (aiodns and tldextract).
License · maintenance · safety
BSD 3-Clause License (permissive) — BSD 3-Clause License is permissive and imposes minimal restrictions on use, modification, and distribution in both open-source and commercial contexts.
last release 2026-07-29 (16 days) · last repo commit 2026-08-13 · 36 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 75,235 downloads/mo, #14,735 on PyPI
Alternatives
Verify before relying
pip install email-normalize
import email_normalize
result = email_normalize.normalize('f.o.o+bar@gmail.com')
print(result.normalized_address) # foo@gmail.com
print(result.mailbox_provider) # Google- Whether aiodns and tldextract have their own security or maintenance concerns that could affect this package's reliability.
- Performance characteristics when processing large batches of addresses with DNS lookups enabled.
What it is and what it does
email-normalize is a Python 3.11+ library that takes email addresses and returns their canonical form by detecting the mailbox provider and applying provider-specific normalization rules. It handles behaviors like Gmail's plus addressing (foo+bar@gmail.com → foo@gmail.com) and period stripping (f.o.o@gmail.com → foo@gmail.com), and folds provider alias domains to a single form (googlemail.com → gmail.com). The library supports both synchronous and asynchronous workflows, with the async interface maintaining an LFRU cache of MX lookups for efficient batch processing.
The package normalizes against a known set of providers including Apple, Fastmail, Google, Microsoft, ProtonMail, Rackspace, Yandex, and Zoho. It can perform DNS lookups to detect custom domains and retrieve MX records, or skip DNS entirely and normalize only against well-known domains using a static map. This flexibility makes it suitable for scenarios ranging from simple email deduplication to comprehensive provider detection in applications that need to understand mailbox behavior.
Use it for
- Deduplicating user email addresses in signup forms or databases where users may have entered equivalent addresses using plus addressing or periods.
- Detecting which mailbox provider a user is using to apply provider-specific features or restrictions in your application.
- Batch processing large lists of email addresses asynchronously to normalize them and retrieve MX records for delivery validation.
- Normalizing email addresses in offline mode (skip_dns=True) when DNS lookups are unavailable or undesired.
- Canonicalizing email addresses for user identity matching across systems that may have received them in different formats.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
The package is actively maintained, has no known vulnerabilities, uses a permissive license, and solves a real problem in email handling with low install friction. It's well-suited for applications that need reliable email normalization across multiple providers, especially those requiring async support or batch processing.
Install
email-normalize on PyPI
Before you install
Low friction installation with only two runtime dependencies (aiodns and tldextract). The package is actively maintained with a recent release and supports current Python versions (3.11+).
Requires Python 3.11 or later. Runtime dependencies aiodns and tldextract must be installed (handled automatically by pip).
License in practice
BSD 3-Clause License is permissive and imposes minimal restrictions on use, modification, and distribution in both open-source and commercial contexts.
Quickstart
pip install email-normalize
import email_normalize
result = email_normalize.normalize('f.o.o+bar@gmail.com')
print(result.normalized_address) # foo@gmail.com
print(result.mailbox_provider) # GoogleVerify before relying
- Whether aiodns and tldextract have their own security or maintenance concerns that could affect this package's reliability.
- Performance characteristics when processing large batches of addresses with DNS lookups enabled.
Package facts
| License | BSD 3-Clause License permissive |
| Python support | Supports the current Python release >=3.11 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagesaiodnstldextract |
| Maintenance | Actively maintained 16 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 75,235 / month, #14,735 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableFramework :: AsyncIOIntended Audience :: DevelopersLicense :: OSI Approved :: BSD LicenseNatural Language :: EnglishOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: Implementation :: CPythonTopic :: CommunicationsTopic :: Communications :: EmailTopic :: InternetTopic :: Software DevelopmentTyping :: Typed |
Evidence: email_normalize-3.2.0-py3-none-any.whl
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See also email-validator · pyIsEmail · free-email-domains · validate_email · disposable-email-domains · emval · mailsuite · url-normalize · bnunicodenormalizer · IMAPClient