I got this reply from them
Dear Sir/Madam
Thank you for communicate with us. Concerning your question about how to extract the good conduct certificate from outside the country, please check the following
Requirements for applying for Police Clearance Certificate (PCC) from outside the country
There are three ways to apply for the PCC from outside the country
1- Throw the Qatar embassy
2- Applying via express mail by sending all the required documents + 50USD fee to the following address
ADDRESS:
Ministry of the Interior
Department of Criminal Evidences and Information – Salwa road
Zone no:55, Area no:30
PO Box 23004 phone : 2346737-2346717
3- The applicant can ask a relative or a friend in Doha to applied and receive the PCC by sending him all the required documents with the power of attorney certified by the court and the competent authorities in the applicant country and the Embassy of the State of Qatar & the ministry of foreign affair, the certificate must also have the relative/friend Qatari Id number, the full name and must pay the processing fee on the applicant behalf for the certificate in Qatari Riyal its will be 10 QR only.
Document required for the PCC
· A formal letter addressed to Mr./ Director General of evidence and criminal information shows the certificate request and purpose.
- Clear copies of relevant pages of applicant's current passport and old passport that was used while in Qatar with personal particulars, residence permit, dates of first entry to the country and last exit from the country.
- If you were not resident of the State of Qatar or for visit visa or tourist visa attach full set of fingerprints (original) duly attested by a competent government authority at the country of the applicant.
- Two recent passport-size photographs
- US$ 50 (fifty US Dollars) in Cash as processing + mailing fee from outside the country, from inside the country 10 QR .
Notes:
If the applicant is a resident born in Doha doesn't have to attach the PCC from his country with the application for the PCC from Qatar. But he should attach a copy of the birth certificate with the application. Those who entered the country while they were under 16 years old should produce a copy of the passport that contains the date of first entry to the country.
Thanks & Regards