Error Message
Details 
Solution
Error: The file contains more rows than is permitted. 
The system has a maximum row limit of 500,000 and your file has exceeded this amount
Try splitting your file, so there is up to 500,000 rows contained with it or Contact us to discuss our large file service.
Wrong file type (.csv, .txt only).
The file you are trying to upload is not supported.
The file must be in a .CSV or .TXT format. Open up your file using your normal application and go to Save As and save the file with the file type of either CSV (Comma delimited) or TXT (Text File).
Error: Fixed width files are not supported. Please use comma, semicolon or tab-delimited files.
The fixed-width format is not accepted by our system.
You will need to convert your file form fixed width to either CSV (Comma delimited) or .TXT (Text File).
Error: The CSV structure is invalid.
The structure or formatting of your CSV file is incorrect.
Please read our article CSV Made Easy.
You can't upload files of this type.
The file you are trying to upload is in the incorrect format.
You will need to convert your file form fixed width to either CSV (Comma delimited) or .TXT (Text File).
Error: There is no data in the file.
The system is unable to find any data in the file. This is usually caused by: no data or incorrect formatting.
Visually check the file contains the correct data.
Error: Unable to find any valid email addresses in the file.
The system is unable to find any valid email addresses. This is usually caused by incorrect formatting.
 
Please read our article CSV Made Easy. 
 
Error: Single line CSV files are unsupported.
 
The file is incorrectly formatted for our system.
 
Each email address should be on a separate row within your file. 
File is too big (xxx.xx MB). Max file size: 100MB.
The system has a maximum file size limit of 100MB and your file exceeds this amount.
Try splitting your file, so each file is under 100MB in size or Contact us to discuss our large file service.
This exceeds our recommended thresholds.

These thresholds enable us to contact mail servers repeatedly and at speed. If we allow processing to take place on this file the results would be likely to fall below our quality standards of 97% - 99% accuracy. 

Please amend your file to pass the thresholds: 

Each domain to be less than 90% of the total number of email addresses