What is the ruling on sending electronic messages of da‘wah and reform directed at both sexes, and does exchanging them constitute a form of intermingling (ikhtilat)?

Sending da'wah (Islamic propagation) messages is a great and beneficial act that spreads good due to its ease, and due to what is mentioned in the hadith: "Whoever calls to guidance will have a reward like the rewards of those who follow him, without that diminishing anything from their rewards." And His (peace be upon him) saying: "Convey from me, even if it is a single verse." It is a condition to verify the authenticity of what is published. The exchange of these messages between genders is not considered intermingling. If the messages are directed to men who do not know you, or to your male family members and relatives whom you know, and if no meetings, conversations, or relationships result from them, then there is no harm in that. However, if these messages become a pretext for men to contact you, to establish relationships with them, and to meet them, then this is a gateway to tribulation and evil. Therefore, a Muslim woman must beware of the steps of Satan and limit herself to sending messages without opening the door to relationships, exchanging correspondence, or phone calls. If she finds herself weak and attached to someone, she should stop messaging him.