---
name: "Sisimai::Reason::SyntaxError"
section: "3pm"
platform: "linux"
package: "libsisimai-perl"
version: "5.3.0-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Sisimai::Reason::SyntaxError"
---

# Sisimai::Reason::SyntaxError(3pm)

Bounce reason is "syntaxerror" or not.

## NAME

Sisimai::Reason::SyntaxError - Bounce reason is "syntaxerror" or not.

## SYNOPSIS

```
    use Sisimai::Reason::SyntaxError;
    print Sisimai::Reason::SyntaxError->text;   # syntaxerror
```

## DESCRIPTION

`"Sisimai::Reason::SyntaxError"` checks the bounce reason is `"syntaxerror"` or not. This class is called only `"Sisimai::Reason"` class.

This is the error that the destination mail server could not recognize the SMTP command which is sent from the sender's MTA. Sisimai will set `"syntaxerror"` to the reason if the value of `"replycode"` begins with `50` such as `502`, or `503`.

```
    Action: failed
    Status: 5.5.0
    Diagnostic-Code: SMTP; 503 Improper sequence of commands
```

## CLASS METHODS

### "text()"

`text()` method returns the fixed string `"syntaxerror"`.

```
    print Sisimai::Reason::SyntaxError->text;  # syntaxerror
```

### "match(string)"

`match()` method always return `"undef"`

### "true(Sisimai::Fact)"

`true()` method returns `1` if the bounce reason is `"syntaxerror"`. The argument must be `"Sisimai::Fact"` object and this method is called only from `"Sisimai::Reason"` class.

## AUTHOR

azumakuniyuki

## COPYRIGHT

Copyright (C) 2015-2016,2018,2020,2021,2024 azumakuniyuki, All rights reserved.

## LICENSE

This software is distributed under The BSD 2-Clause License.