Fax SMTP – Advanced Usage
This section explains how to perform advanced operations when sending faxes using our fax SMTP.
The following sections are below;
Subject line modifiers
The following modifiers may be added to the end of the email’s Subject line to modify InterFAX’s behavior.
| Modifier | Description | Usage |
|---|---|---|
| /b | Attachment Indicator – Forces transmission of message body when both an attachment and an email body are present The default behavior is set through account preferences. |
[Subject] /bSee Sending Attachments |
| /bn | Attachment Negative Indicator – Negates transmission of body when “Always include message body” is selected in account preferences. | [Subject] /bn |
| /bb | Send only email body – Suppresses transmission of any attachments. | [Subject] /bb |
| /ib | Specifies to include the background colors and images in an HTML document. | [Subject] /ib |
| /h | Header Indicator – Specifies to use a header in the outgoing fax. The header string follows (see account preferences for header string syntax). | [Subject] /h {header string} |
| /hn | Header Negative Indicator – Negates usage of a header in the outgoing fax when a fax header is defined in account preferences . | [Subject] /hn |
| /d | Defer transmission to a later time and (optionally) date Default: Send immediately |
[Subject] /d yyyy-mm-dd hh:mm |
| /fonttype | Specifies the font to be used in a text document. The list of acceptable fonts is visible in the account’s outgoing preferences. This setting has no effect on document types which internally indicate font types, such as Word and HTML. | [Subject] /fonttype {font name} |
| /fontsize | Specifies the font size to be used in a text document. This setting has no effect on document types which internally indicate font sizes, such as Word and HTML. | [Subject] /fontsize {font size} |
| /rs /rf |
Resolution – sets the rendering resolution of the document – standard or fine. Default: As defined in user sending preferences, usually standard Note: Do not use more than one of these modifiers at a time |
[Subject] /rs[Subject] /rf |
| /gs /mono |
Rendering optimized for greyscale (gs) or monochrome (mono) Default: As defined in user sending preferences, usually greyscale Note: Do not use more than one of these modifiers at a time |
[Subject] /gs[Subject] /mono |
| /Landscape /Portrait |
Page Orientation for printing HTML/URL files, or other documents which do not include orientation. Default: As defined in user sending preferences, usually Portrait Note: Do not use more than one of these modifiers at a time |
[Subject] /Landscape[Subject] /Portrait |
| /A4 /Letter /Legal /B4 |
Page size. Default: As defined in user sending preferences, usually A4 for subscribers outside the US, Letter for US subscribers. Note: Do not use more than one of these modifiers at a time |
[Subject] /A4[Subject] /Letter[Subject] /Legal[Subject] /B4 |
| /at | Number of transmission attempts to perform, in case of fax transmission failure. Legal values: 1 – 10 Default: 4, or as defined in sending preferences |
[Subject] /at 5 will make up to 5 attempts |
| /rti | Minimum retry interval in minutes, i.e. the duration that the system will wait after a failed transmission attempt before performing a subsequent attempt. Legal values: 1 – 30Default: 3, or as defined in sending preferences |
[Subject] /rti 2will wait at least 2 minutes between attempts |
Note: Modifiers may be combined like:[Subject] /b /d 2002-01-01 18:01 /rs /Legal |
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Sending attachments
Several document attachments may be faxed in one message. The following table lists the resulting output, depending on usage of the /b and /bn modifiers.
| Email Contents | /b present | /b missing | “Always include message body” option selected, /bn present | “Always include message body” option selected, /bn missing |
|---|---|---|---|---|
| Message Body Only | Message Body | Message Body | Message Body | Message Body |
| Attachment Only | Attachment | Attachment | Attachment | Attachment and a blank page |
| Message Body and Attachment | Both | Attachment Only | Attachment Only | Both |
Supported Attachment Types
See the Supported File Types article.
Password Authentication
Users who wish to apply an additional level of security to their faxing may elect to send their password with each outgoing email. This will offer another layer of identification in addition to the standard From header used by InterFAX to identify its users.
First, you will need to set this requirement in your user account. After logging in to your account, go to My Settings > Outgoing Options > Allowed Emails > Authentication. Check the Authenticate sender by password check box.
Now, each time you send an email, add your password somewhere in the message body in the following format: !#password. For example, !#123452.
This entry will be automatically stripped from the outgoing fax. Should the password be missing or incorrect – the fax will not be sent.