SMTP
"smtp" is a 4-letter English headword indexed on PlainSpell.
The verdict
“SMTP” is uncommon English (frequency #65,510 among 6,566 “S” headwords), classed as a proper noun. The kind of spelling people second-guess.
- #65,510
- frequency rank, English
- 6,566
- “S” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of Simple Mail Transfer Protocol, a de-facto standard for email transmission.
Corpus desk
Index EN-smtp · SMTP · English
SMTP · rank #65,510 · 0 variants · 0 confusables
- FREQ-RARE #65,510
- LEN-MID 4 letters
- VOW-0 0 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-DENSE 6,566
- PHOTO-FINISH Smolensk
Nearest frequency peer: Smolensk (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Long-tail ranks near “SMTP”
Sparse band: bars invert rank so rarer forms read shorter
- Smokies
Smokies
34,493 corpus weight
- Smolensk
Smolensk
34,492 corpus weight
- SMTP
SMTP
34,491 corpus weight
- snowpack
snowpack
34,490 corpus weight
- socialistic
socialistic
34,488 corpus weight
- soju
soju
34,486 corpus weight
What this shows Long-tail view: where “SMTP” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | SMTP |
| Language | English |
| Part of speech | Proper noun |
| Letters | 4 |
| Frequency rank | #65,510 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “SMTP” in English
Rare enough to double-check
SMTP is uncommon English at frequency #65,510 among 6,566 “S” headwords, classed as aproper noun. Rarity is why readers land here mid-draft. Gloss: "Initialism of Simple Mail Transfer Protocol, a de-facto standard for email transmission.".
Zero misspellings are on record for SMTP in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. This entry stands alone in our confusable dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Our source data has no etymology on file for this entry, so its spelling is easiest to reason about phoneme by phoneme, absent a documented history. The correct English form is SMTP, spelled S-M-T-P.
Definition
- 1Initialism of Simple Mail Transfer Protocol, a de-facto standard for email transmission.
Recorded use
Wiktionary exampleThese source excerpts show how SMTP appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
The objective of Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "SMTP", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 4 letters (nearest by frequency rank).