If you want to apply for a visa, please read the following points carefully to avoid any probable case of denial.
To apply for all types of electronic visas, your passport should have at least six months of validity, beyond your actual travel date. Obviously, you are not able to submit your application, if your passport is expiring in less than 6 months.
The Iranian visa sticker displays some information including the validity of visa. Failure to travel to Iran during the validity of visa will prevent you from entering Iran and you will need to re-apply for a visa.
All types of visa defined by the government of the Islamic Republic of Iran can be applied for through the online visa application portal. Notwithstanding, some types of visa for the citizens of some countries should be applied for only in person through the relevant Embassy of the Islamic Republic of Iran.
The citizens of some countries may not be issued visa to enter the Islamic Republic of Iran due to political and diplomatic considerations. Citizens of such countries shall refer to the relevant Embassy of the Islamic Republic of Iran for further information.
You can find here the last news and information regarding the latest changes in the visa rules and regulations.