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  1. Some special fields that are reserved for e-mail, mobile phone number, and mobile phone number + country code.
  2. Customizable personal data fields. Personal data fields (e.g. first name, last name, etc.) have a numeric ID that goes from 1 to 11 (1 to 40 if the Marketing+ package has been added to your account39 (it could be less than 39 for some subscription plans, please ask if you need an uprgade to 39).

Special Fields

MailUp contains the following special fields, which cannot be modified.

Field NameField ID
E-mail address111
Mobile phone number's country code222
Mobile phone number333
Complete mobile phone number (country code + number)444

Personal Data Fields

This is just an example of personal data fields in MailUp. They are customizable, meaning that field #2 does not have to be the Last Name. In your MailUp admin console, you will find them under Manage > Personal Data Fields.

Field Name

Field ID

E-mail address111 (cannot be altered, see above)
First Name1
Last Name2
Date of Birth10


A file to be imported shall contain a header row and one record for each recipient to be imported. The '|' (pipe) symbol is used as a separator and each row must contain exactly the same number of columns.

Basically, as soon as you respect the rules above, you are free to choose the type, order and number of columns you prefer. In this paragraph you can have a look at some examples, 

Subscription on Email channel

Let's say that your CSV file contains these columns:

Position in the CSV file

Field Name

Column position

Field ID*Example
First Name1Cognome1Peter
Last name22Smith
Date of Birth3101978-03-16

The columns in your CSV file need to be mapped to the corresponding fields in MailUp, so you will need to add a header row to the CSV file with the following values:




*MailUp personal field ID or special field ID (refer to previous table for special fields)

This is an example of the file content

Code Block
titleUse 111 in the header row for the email address. For the other columns use the ID of the corresponding field in MailUp.


Subscription on SMS channel

For international prefix and mobile number you can either use two separate fields or a single field

Code Block
titleTwo separate fields (use 222 and 333 in the header row). If you leave the int. prefix empty, the default list settings will be used
Code Block
titleOne single field for mobile number (use field ID 444 in the header row)

Subscription on both Email and SMS channels

Mixing the scenarios described above, here is an example with both email and SMS

Code Block
titleOne single field for mobile number (use field ID 444 in the header row)