Ruling on a woman smiling at Muslim men from other countries to make them feel welcome
Question

                What is the ruling on women smiling to the newly converted Muslim men in order to make them feel that we all are one, as they might be mistreated by some? What is the ruling on women smiling to men and the opposite generally?.
Praise be to Allah.
    Firstly: 

    Women should cover their faces in front of non-mahram men, 
    because of a great deal of evidence that has been quoted in the answer to 
    question no. 11774. Based on 
    this, she should not be smiling in this manner in the first place.  

    Secondly: 

    A great deal of shar’i evidence indicates that it is not 
    allowed to do that which may cause men to be tempted by women and vice 
    versa, such as shaking hands, being alone with a member of the opposite sex, 
    speaking in a soft voice, a woman going out wearing perfume so that its 
    fragrance may be smelt, a man looking at women and a woman looking at men if 
    that is with desire. 

    See the answer to question no.
    84089 for more information on 
    the evidence concerning that. 

    For a woman to smile at a man to be kind to them for the 
    purpose referred to in the question implies that each of them is looking at 
    the other, and that is forbidden because Allaah says (interpretation of the 
    meaning): 

    “Tell the believing men to lower their gaze (from looking 
    at forbidden things), and protect their private parts (from illegal sexual 
    acts). That is purer for them. Verily, Allaah is All‑Aware of what they do.

    31. And tell the believing women to lower their gaze (from 
    looking at forbidden things), and protect their private parts (from illegal 
    sexual acts) and not to show off their adornment except only that which is 
    apparent (like both eyes for necessity to see the way, or outer palms of 
    hands or one eye or dress like veil, gloves, headcover, apron), and to draw 
    their veils all over Juyoobihinna (i.e. their bodies, faces, necks and 
    bosoms) and not to reveal their adornment except to their husbands, or their 
    fathers, or their husband’s fathers, or their sons, or their husband’s sons, 
    or their brothers or their brother’s sons, or their sister’s sons, or their 
    (Muslim) women (i.e. their sisters in Islam), or the (female) slaves whom 
    their right hands possess, or old male servants who lack vigour, or small 
    children who have no sense of feminine sex. And let them not stamp their 
    feet so as to reveal what they hide of their adornment. And all of you beg 
    Allaah to forgive you all, O believers, that you may be successful”

    [al-Noor 24:30-31]

    This smiling may have an effect on the heart that is not less 
    than the effect of soft speech, and it may lead to the fitnah (temptation) 
    that Allaah has warned against when He said (interpretation of the 
    meaning): 

    “O wives of the Prophet! You are not like any other women. 
    If you keep your duty (to Allaah), then be not soft in speech, lest he in 
    whose heart is a disease (of hypocrisy, or evil desire for adultery) should 
    be moved with desire, but speak in an honourable manner”

    [al-Ahzaab 33:32]

    The Standing Committee for Issuing Fatwas was asked: What is 
    the ruling on a woman who smiles in front of a non-mahram man, but without 
    showing her teeth and without making any sound? 

    They replied: 

    It is haraam for a woman to uncover her face or to smile at a 
    non-mahram man, because of the evil to which that leads. And Allaah is the 
    Source of strength. May Allaah send blessing and peace upon our Prophet 
    Muhammad and his family and companions. End quote. 

    The Standing Committee for Academic Research and Issuing 
    Fatwas. 

    ‘Abd al-‘Azeez ibn ‘Abd-Allaah ibn Baaz, ‘Abd al-Razzaaq 
    ‘Afeefi, ‘Abd-Allaah ibn Ghadyaan. 

    End quote from Fataawa al-Lajnah al-Daa’imah (17/25).

    With regard to the Muslims from other countries whom you 
    mention, the Muslims should honour them, make them feel welcome and take 
    care of them, without doing anything that is haraam. Men should take care of 
    men and women should take care of women. You will find many Muslim women who 
    need your care and kind treatment. 

    May Allaah increase us and you in guidance. 

    And Allaah knows best.