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Mail configuration options

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Mail configuration optionsNameDefaultChangeableChangelogmail.add_x_header"0"INI_PERDIRmail.mixed_lf_and_crlf"0"INI_SYSTEM|INI_PERDIRAdded in PHP 8.2.4mail.logNULLINI_SYSTEM|INI_PERDIRmail.force_extra_parametersNULLINI_SYSTEMSMTP"localhost"INI_ALLsmtp_port"25"INI_ALLsendmail_fromNULLINI_ALLsendmail_path"/usr/sbin/sendmail -t -i"INI_SYSTEM Constants

Runtime Runtime

Name	Default	Changeable	Changelog
mail.add_x_header	"0"	`INI_PERDIR`
mail.mixed_lf_and_crlf	"0"	`INI_SYSTEM`\|`INI_PERDIR`	Added in PHP 8.2.4
mail.log	NULL	`INI_SYSTEM`\|`INI_PERDIR`
mail.force_extra_parameters	NULL	`INI_SYSTEM`
SMTP	"localhost"	`INI_ALL`
smtp_port	"25"	`INI_ALL`
sendmail_from	NULL	`INI_ALL`
sendmail_path	"/usr/sbin/sendmail -t -i"	`INI_SYSTEM`

Constants

Title

mail.add_x_headerbool

Add X-PHP-Originating-Script that will include UID of the script followed by the filename.

mail.logstring

The path to a log file that will log all mail() calls. Log entries include the full path of the script, line number, To address and headers.

mail.mixed_lf_and_crlfbool

Allows reverting the line separator for email headers and message bodies to LF (Line Feed), mimicking the non-compliant behavior of PHP 7. It is provided as a compatibility measure for certain non-compliant Mail Transfer Agents (MTAs) that fail to correctly process CRLF (Carriage Return + Line Feed) as a line separator in email headers and message content.

mail.force_extra_parametersstring

Force the addition of the specified parameters to be passed as extra parameters to the sendmail binary. These parameters will always replace the value of the 5th parameter to mail().

In addition to the default behavior for INI_SYSTEM, this value can also be set with php_value in httpd.conf (but this is not recommended).

SMTPstring

Used under Windows only: host name or IP address of the SMTP server PHP should use for mail sent with the mail() function.

smtp_portint

Used under Windows only: Number of the port to connect to the server specified with the SMTP setting when sending mail with mail(); defaults to 25.

sendmail_fromstring

Which "From:" mail address should be used in mail sent directly via SMTP (Windows only). This directive also sets the "Return-Path:" header.

sendmail_pathstring

Where the sendmail program can be found, usually /usr/sbin/sendmail or /usr/lib/sendmail. configure does an honest attempt of locating this one for you and set a default, but if it fails, you can set it here.

Systems not using sendmail should set this directive to the sendmail wrapper/replacement their mail system offers, if any. For example, Qmail users can normally set it to /var/qmail/bin/sendmail or /var/qmail/bin/qmail-inject.

qmail-inject does not require any option to process mail correctly.

This directive works also under Windows. If set, smtp, smtp_port and sendmail_from are ignored and the specified command is executed.

Source: reference/mail/ini.xml · from the official PHP manual (php/doc-en)